# Mathathon 2021

If you don't know what the Mathathon is, its a contest I started on Brilliant.org, where I post Math and Logic problems of varying difficulty, and score the solution that the participants create. Highest score wins. You can check my Profile for my posts on the Mathathon 2020.

So, the last Mathathon was held in the second half of 2020, somewhere around July-August I reckon, but this time, I'm gonna hold it in the March-April period because I will be very busy after then (Busy studying, surely not playing games).

I have changed up some things, and this Mathathon will be better planned than the last one.

$\large \text{MATHATHON 2021}$

The Mathathon 2020 was a contest where I post a series of problems and score the solutions. The Mathathon 2021 is the same, except we have different rules.

I shall add the number of problems and the posting scheldule below later (coz its a draft), and you can solve them at anytime you want.

(I dunno what to do now, I am really bad at this hosting thing...)

Your solution will be graded as follows -

Accuracy - $10$ points

Readability - $10$ points

Ingenuity - $10$ points

Bringing us to a total of $30$ points. (Bonus points if you say you love the Dream SMP!)

(I was kidding, if you didn't get it...)

(Now, the last time I had included time zones and Latex and all that sh*t, and in retrospect, that was a very stupid idea, so this time, I will try to be a more...um...a person with more IQ, coz I'm big-brained, yeah...)

Accuracy is basically correctness. Whether every calculation, assumption, or the final answer is correct.

Readability is neatness and clarity. Your solution must be clear and easily understandable, organized, not a clutter of numbers if you want to score here. Latex, images and GIF's are all included in this part. Unnecessary images, Latex or GIF's will not be awarded more points.

Ingenuity is your method of solving the problem. For this, my friends and I (Yes, I have friends...) will each make a solution for the problem. The most used solution will be counted as the most common solution, so if your solution sways away from the common solution, you score here. Your solution should make people go 'Aha!' or 'Clever trick!' to score here.

My friends are all smart, and I've told them about this, so they're not messing around and are taking this seriously. No bias will be allowed in this contest.

(I'm an anti-social person, so I've got $5$ friends, don't judge.)

Problem schedule :

Problems $1, 2, 3$ and $4$ will be released on $22nd$ March and will be of easy difficulty.

Problems $5, 6, 7$ and $8$ will be released on $24th$ March and will be of medium difficulty.

Problems $9$ and $10$ will be released on $26th$ March and will be of hard difficulty.

All solutions posted on or before April $1st$ will be considered. I will send out the results on April $2nd$.

If you haven any queries or issues, please comment here

If you would like to view the list of participants and their points, go here

If you want the links of the problems and discussions related to the Mathathon, go here

Announcements -

25 members have joined, no more members may join. If someone drops out, members in order of time priority may join.

There is a new judge, Jason Gomez! He will help me with the scoring. He is not participating. No more judges will be allowed now!

Note by A Former Brilliant Member
4 months, 4 weeks ago

This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of math and science.

When posting on Brilliant:

• Use the emojis to react to an explanation, whether you're congratulating a job well done , or just really confused .
• Ask specific questions about the challenge or the steps in somebody's explanation. Well-posed questions can add a lot to the discussion, but posting "I don't understand!" doesn't help anyone.
• Try to contribute something new to the discussion, whether it is an extension, generalization or other idea related to the challenge.
• Stay on topic — we're all here to learn more about math and science, not to hear about your favorite get-rich-quick scheme or current world events.

MarkdownAppears as
*italics* or _italics_ italics
**bold** or __bold__ bold
- bulleted- list
• bulleted
• list
1. numbered2. list
1. numbered
2. list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1paragraph 2

paragraph 1

paragraph 2

[example link](https://brilliant.org)example link
> This is a quote
This is a quote
    # I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
MathAppears as
Remember to wrap math in $$ ... $$ or $ ... $ to ensure proper formatting.
2 \times 3 $2 \times 3$
2^{34} $2^{34}$
a_{i-1} $a_{i-1}$
\frac{2}{3} $\frac{2}{3}$
\sqrt{2} $\sqrt{2}$
\sum_{i=1}^3 $\sum_{i=1}^3$
\sin \theta $\sin \theta$
\boxed{123} $\boxed{123}$

## Comments

Sort by:

Top Newest

Anyone can join. I will allow the first $25$ members that join to participate, no more because I am not Simon Cowell. If you wish to join, reply to this comment saying you want to join. Please follow discipline and comment as a reply, because if I don't see your comment in the replies, I won't add you, even if you commented elsewhere on my note. Your comment format should be as follows -

I want to join.

No, I'm kidding just type whatever you want...

- 4 months, 4 weeks ago

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I want to join

No, I'm kidding just type whatever you want...

- 4 months, 4 weeks ago

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bruh lol ok I'll add you once I complete this :)

- 4 months, 4 weeks ago

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I want to join.

- 4 months, 4 weeks ago

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Okay, I will add you once I complete this.

- 4 months, 3 weeks ago

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Comments Subscribe Sort by:TopNewest 1 0 Anyone can join. I will allow the first 2525 members that join to participate, no more because I am not Simon Cowell. If you wish to join, reply to this comment saying you want to join. Please follow discipline and comment as a reply, because if I don't see your comment in the replies, I won't add you, even if you commented elsewhere on my note. Your comment format should be as follows -

I want to join.

No, I'm kidding just type whatever you want...

Percy Jackson - 1 day, 17 hours ago Hide 2 Replies Reply I want to join No, I'm kidding just type whatever you want...

Jason Gomez - 1 day, 7 hours ago Hide 1 Reply Reply bruh lol ok I'll add you once I complete this :)

Percy Jackson - 1 day, 7 hours ago Hide 1 Reply Reply @Percy Jackson – Thanks :)

Jason Gomez - 21 hours ago Hide 1 Reply Reply @Jason Gomez – @Percy Jackson, will I participate ?

Newton KAYODE - 21 hours ago Hide 1 Reply Reply @Newton Kayode – Mostly you will, percy will tell you once he comes online

Jason Gomez - 21 hours ago Reply I want to join.

Newton KAYODE - 21 hours ago Hide 1 Reply Reply Okay, I will add you once I complete this.

Percy Jackson - 3 hours ago Reply

Write a comment or ask a question...

i want to join

- 4 months, 3 weeks ago

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What the hell dude...I'll add you once this is done...

- 4 months, 3 weeks ago

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Mwah hah hah!

- 4 months, 3 weeks ago

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u have discord? ill delete this once u reply

- 4 months, 3 weeks ago

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Yes, why?

- 4 months, 3 weeks ago

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friend me my user is: NSCS_737#2887

- 4 months, 3 weeks ago

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Can't because of this

- 4 months, 3 weeks ago

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so your telling me you have 1000 friend requests or friends? there is a useful invention called ignore all and unfriend lol

- 4 months, 3 weeks ago

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I will not unfriend all my actual friends just to add you. I'll check for useless old friends and stuff. Its mostly because of the repl.it discord, most of them are my friends lol

- 4 months, 3 weeks ago

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im not saying unfriend everyone.. just unfriend one person that hasnt been on for like a yaer or something

- 4 months, 3 weeks ago

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I'll try but looking for one friend that's offline in a 1000 is like searching for a needle in a 1000 haystacks.

- 4 months, 3 weeks ago

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goto freindslist and scroll al the way to bottom and unfreind person at very bottom

- 4 months, 3 weeks ago

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I want to join.

- 4 months, 3 weeks ago

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I will add you when this is done!

- 4 months, 3 weeks ago

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Thanks!

- 4 months, 3 weeks ago

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I want to join.

- 4 months, 3 weeks ago

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Will add you once its done :)

- 4 months, 3 weeks ago

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George not found is underrated

- 4 months, 3 weeks ago

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Haha, he is. You're in the contest!

- 4 months, 3 weeks ago

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I want to join.

- 4 months, 3 weeks ago

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You didn’t spam...

- 4 months, 3 weeks ago

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So, did I spam?

- 4 months, 3 weeks ago

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Ofc you didn’t even I said the same

- 4 months, 3 weeks ago

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Haha, I see what you did just now, tit for tat :)

- 4 months, 3 weeks ago

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Lol, I imagine Percy Jackson being extremely confused reading this

- 4 months, 3 weeks ago

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visible confusion

- 4 months, 3 weeks ago

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I want to join

- 4 months, 3 weeks ago

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This seems interesting, I want to join

- 4 months, 3 weeks ago

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I want to join.

Or do I? (yes I actually do that was a joke).

- 4 months, 3 weeks ago

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I am willing to join

- 4 months, 3 weeks ago

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But I am not good with writing solutions in the website can I send it your email

- 4 months, 3 weeks ago

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No, I'm kidding just type whatever you want...

WHATEVER YOU WANT

Anyways i am interested... Nice initiative

- 4 months, 3 weeks ago

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i want to join

- 4 months, 3 weeks ago

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I want to join

- 4 months, 3 weeks ago

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Admissions are closed, unless someone drops out no more will be allowed

- 4 months, 2 weeks ago

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I want to join.

- 4 months, 2 weeks ago

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Unfortunately all 25 places have been taken, if a participant doesn’t intend to participate later, I will notify you :)

- 4 months, 2 weeks ago

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thank you very much to the MATHATHON 2021 team for their effort.
i enjoy the Mathathon problems very much.

- 4 months, 1 week ago

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Thanks @num IC ! We're glad you enjoy the problems so much!

- 4 months, 1 week ago

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Admissions are closed, unless someone drops out no more will be allowed

- 4 months, 2 weeks ago

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please? I'm 14 and kind of smart

- 4 months, 2 weeks ago

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you still can solve the questions but keep the explanations until someone drops out or the mathathon is over.

- 4 months, 2 weeks ago

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I will let you know if you can join (some participants are not really active, and might want to drop out later)

- 4 months, 2 weeks ago

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@Daniel Moore You are in! Please respond to this message to confirm your participation (and also anybody else who thinks this formal tone is cringe)

- 4 months, 1 week ago

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'Formal tone' Cringe

'Informal tone' Pog

'I'mma say whatever I want tone' POGCHAMP!

lmao

- 4 months, 1 week ago

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Reply

- 4 months, 1 week ago

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@Percy Jackson Yup he’s in

- 4 months, 1 week ago

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Okay, I'll add the kinda smart fella.

- 4 months, 1 week ago

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Informal- You can try out the Mathathon questions and give solutions to them now

Formal-Do try out the Mathathon questions and if possible give solutions too

- 4 months, 1 week ago

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Hey!! By when should we be expecting the judging🙄

- 3 months, 4 weeks ago

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Ig they are testing our patience as well

- 3 months, 4 weeks ago

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lmao

- 3 months, 4 weeks ago

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hmmmmmm XD

- 3 months, 4 weeks ago

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Is dream so popular now? Oh god... I love minecraft!

- 4 months, 3 weeks ago

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Dream and the Dream SMP. They literally dominated 2020, and the Dream SMP is coming to its final stages, with Dream proving that he has a revival book.

- 4 months, 3 weeks ago

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Oh I simply know about manhunt... not interested in the Dream SMP. Users are mad about manhunt in China but see, China has its own free minecraft (after negotiating with bruh) so you’ll know nothing about that :)

- 4 months, 3 weeks ago

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Oh, ok lol the manhunt series is great but the Dream SMP series is absolutely the best work of fiction ever known. It is literally an in-game movie. You should see a few summaries on the series and a few animatics as well!

- 4 months, 3 weeks ago

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Yeah, like... NO! NOT THE PRIME LOG! *TNT explodes *

- 4 months, 3 weeks ago

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lol I'd suggest animativs by SAD-ist and summaries by EvanMCGaming

- 4 months, 3 weeks ago

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And then we have *dream blew up * WAIT! This isn’t in the script!!

- 4 months, 3 weeks ago

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@yera kim - You are in the contest!!!

- 4 months, 2 weeks ago

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This might take a month to prepare :) I’m in!

- 4 months, 3 weeks ago

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Sure, you'll be in once I finish this.

- 4 months, 3 weeks ago

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@Jeff Giff, @NSCS 747 - Can you please delete your unnecessary comments, I would like this note clean so that I don't have to search through too many messages :)

- 4 months, 3 weeks ago

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can i also help with your judging stuff

- 4 months, 2 weeks ago

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Uh...I said only 2 judges, I'm not sure having 3 judges will be very convenient.

- 4 months, 2 weeks ago

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i can keep track of like who submitted a response and stuff like a roll marking for each question i guess?

- 4 months, 2 weeks ago

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Ok, if you want to :)

- 4 months, 2 weeks ago

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k what is the list of members

- 4 months, 1 week ago

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It is given in the Members and Points note. The link is up in the official note.

- 4 months, 1 week ago

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@num IC , @Reyna (Sarah Alam), @Pixel-girl - Wanna join???

- 4 months, 3 weeks ago

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Want to call David Vreken, Siddarth and Vinayak? They might want to join

- 4 months, 3 weeks ago

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Yeah, I'll mention them too. I'm posting this link in today's dc (BM allowed me to)

- 4 months, 3 weeks ago

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Oh nice

- 4 months, 3 weeks ago

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I’ll put in my solution too if I put one up

- 4 months, 3 weeks ago

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Ok, thanks :)

- 4 months, 3 weeks ago

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Is sir Zakir Husain in as well?

- 4 months, 3 weeks ago

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I will mention some more people later. Zakir Husain will be mentioned.

- 4 months, 3 weeks ago

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Yes! I’d love to participate, thanks for mentioning me!

- 4 months, 3 weeks ago

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Great!!! I'll add you to the members list!

- 4 months, 3 weeks ago

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I’d love to participate

- 4 months, 3 weeks ago

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@Zakir Husain, @Siddharth Chakravarty, @Vinayak Srivastava, @David Vreken - Would you like to participate?

- 4 months, 3 weeks ago

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Sure

- 4 months, 3 weeks ago

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Great, I'll add you!

- 4 months, 3 weeks ago

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OK, but my offline school class will start from April, so maybe I won't be much active but I'll try.

- 4 months, 3 weeks ago

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Oh, it will end till 1st April. I did not read it completely. Count me in!

- 4 months, 3 weeks ago

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I will be too busy then and will have to decline, but I appreciate the invite!

- 4 months, 2 weeks ago

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Okay :)

- 4 months, 2 weeks ago

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Count me in!!

- 4 months, 3 weeks ago

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Sure, I'll add you!

- 4 months, 3 weeks ago

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Thanks :)

- 4 months, 3 weeks ago

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I was just wondering whether BM will want to join, they just shouldn’t put staff solutions up in your problems, nor delete other solutions to win that’s all... and not cheat to get the answer right, okay yeah they have too much power

- 4 months, 3 weeks ago

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What if BM is an account used by multiple staff members?

- 4 months, 3 weeks ago

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And why are you assuming Brilliant Mathematics is a ‘he’?

- 4 months, 3 weeks ago

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I didn’t assume the account is owned by a he

- 4 months, 3 weeks ago

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when the gender of a person is not known, or you don't want to mention the gender, the pronoun used shall be 'they'.

- 4 months, 3 weeks ago

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That’s what I put...

- 4 months, 3 weeks ago

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Let call Brilliant Mathematics IT, so we aren’t talking about a thing or object, but a Brilliant Mathematics. We aren’t sure whether IT is a he or she or they, so we call IT, ‘IT’. e.g. IT will make a solution. IT has too much power. IT will delete the comment. e.t.c

- 4 months, 3 weeks ago

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This is for @Sarah Alam, i edited the comment

- 4 months, 3 weeks ago

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@Brilliant Mathematics - Wanna join? (don't cheat tho)

- 4 months, 3 weeks ago

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I have to pass.

Staff - 4 months, 2 weeks ago

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Ok, there's 25 already anyways :)

- 4 months, 2 weeks ago

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There, all your questions will be answered, I mentioned BM.

- 4 months, 3 weeks ago

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Aargh you beat me to it :D

- 4 months, 3 weeks ago

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I want to join

- 4 months, 3 weeks ago

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Put this as a reply to the top comment instead and delete this comment

- 4 months, 3 weeks ago

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I am willing to participate

- 4 months, 3 weeks ago

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But I am not that good with writing solutions in the website but can I send it to your email, if possible then I am willing to participate

- 4 months, 3 weeks ago

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I am pretty sure this would go against the spirit of the competition (everyone needs to see your solution, so that they can agree Percy isn’t biased) and also I am very sure he wont be willing to share his email id with you because we are on an online platform

- 4 months, 3 weeks ago

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Ok but still I will participate and I will try using latex, you can include my name

- 4 months, 3 weeks ago

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Surely

- 4 months, 3 weeks ago

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Thank you

- 4 months, 3 weeks ago

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@Omek K - This is in my opinion the best Latex guide on the platform. You can check for latex codes there and use them. If you have any questions about Latex, you can ask me :)

- 4 months, 2 weeks ago

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Thank you

- 4 months, 2 weeks ago

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I would like to join.

- 4 months, 3 weeks ago

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Hi Percy! This sounds challenging and fun. I am interested in participating if I can still join. LaDonna Carrington

- 4 months, 3 weeks ago

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On second thought, it is best that I do not enter, I am going to be very busy the net few months. Thankyou.

- 4 months, 2 weeks ago

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I want to join if still possible. Thanks

- 4 months, 3 weeks ago

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I would love to join if it is possible Thanks !

- 4 months, 3 weeks ago

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Hi Percy I appoligize if my english sounds weird. It's my fourth language. I am kind of new here, but i'm genuanlly delighted, that you and your friends sacifice your free time to organize this Mathoton. Since only 25 People can participate, i would be very thankful if you and your friends could post the Problems after the Mathoton has taken place. Thank you for considering my suggestion.

Best reagards. -lekonda

- 4 months, 2 weeks ago

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All problems posted can be solved by everyone, it will all be in Percy's homepage, but only those who are in Mathathon can submit solutions to be graded, you can attempt all the problems if you want, but it would be preferable if you put down your solution after 2nd April (25 solutions is itself a huge number to grade, extra solutions coming in might just increase the time spent in searching for the solutions to be graded) , and by the way your English is better than mine :)

- 4 months, 2 weeks ago

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# All 25 participant spots have been occupied! No more applications will be accepted now. All the 25 names have been listed in the members and points note!

- 4 months, 2 weeks ago

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How to write in such a big font?

- 4 months, 2 weeks ago

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# Use hashtag # in the beginning

- 4 months, 2 weeks ago

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# Thanks

- 4 months, 2 weeks ago

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# huh

- 4 months, 2 weeks ago

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# ok

- 4 months, 2 weeks ago

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# enf hue

- 4 months, 2 weeks ago

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# so it works with spaces ok

- 4 months, 2 weeks ago

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# and if # you put another

- 4 months, 2 weeks ago

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it does nothing

- 4 months, 2 weeks ago

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## If you put double or triple or other kinds of combinations involving # (also you can put hashtags in the end) you can type the other type of headings

- 4 months, 2 weeks ago

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## test

- 4 months, 2 weeks ago

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#### test4

- 4 months, 2 weeks ago

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# test2

- 4 months, 2 weeks ago

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test###

- 4 months, 2 weeks ago

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Where can you find the problems when you post them?

- 4 months, 2 weeks ago

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You can find them in Percy’s homepage and my homepage (practice problems only from mine) and all links will be mentioned in the Mathathon links note which is also in Percys homepage

- 4 months, 2 weeks ago

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- 4 months, 2 weeks ago

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thxs

- 4 months, 2 weeks ago

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NO!!!! I'm so sad!! I really wanted to participate, I even put your draft in my favorites (when you asked the permission of staff to publish about it some 2 weeks ago), but there was no note back then that there would be a maximum of participant... Well, maybe next year! ;) Keep up the good work and I hope we will be able to at least see the different problems of this year even if we don't participate! Wish you the best, really a great project! :D

- 4 months, 2 weeks ago

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Thanks! I won't be making this next year. I'll be too busy. I'll ping you if a participant goes out so that you can join :)

- 4 months, 2 weeks ago

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@Julie Love-Brilliant - A member has dropped out because of some reasons. You're in!!!

- 4 months, 2 weeks ago

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Percy Jackson you really are the best! Well I already knew that, but now you know that I knew! ;)

- 4 months, 2 weeks ago

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congrats! you took the spot i opened i hope you do well i pulled out cus i dont really have much time on brilliant to do this challenge

- 4 months, 2 weeks ago

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lol thanks :)

- 4 months, 2 weeks ago

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how can you write a sentence and put it into a numerator with the spaces

- 4 months, 2 weeks ago

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\(\dfrac{\text{numerator sentence}}{\text{denominator sentence}}\) -> Copy this code and use it :)

- 4 months, 2 weeks ago

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then how did you write it out isn't then going to be (\dfrac{\text{numerator sentence}}{\text{denominator sentence}})

- 4 months, 2 weeks ago

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oh wait comments have no latex

- 4 months, 2 weeks ago

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Comments do have latex. I used a trick to remove formatting :)

- 4 months, 2 weeks ago

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That code displays this - $\dfrac{\text{numerator sentence}}{\text{denominator sentence}}$

I used a secret trick to remove the latex formatting :)

- 4 months, 2 weeks ago

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what's the trick and how do I find my id number cause there's a page with it

- 4 months, 2 weeks ago

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no, its way more complicated.

- 4 months, 2 weeks ago

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ok

- 4 months, 2 weeks ago

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yay I did it my solutions now done

- 4 months, 2 weeks ago

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how do you make the font smaller though

- 4 months, 2 weeks ago

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add a \small before the \text{}

- 4 months, 2 weeks ago

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ok

- 4 months, 2 weeks ago

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then is there a \large

- 4 months, 2 weeks ago

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yes, it makes large text. There is \Large, \LARGE, \huge and \Huge also

- 4 months, 2 weeks ago

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what is the difference between \frac and \dfrac?

- 4 months, 2 weeks ago

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\dfrac is just a short way of writing \displaystyle\frac which makes the styling a bit better for the fraction

$\frac{1}{2}$ This is \frac

$\dfrac{1}{2}$ This is \dfrac

- 4 months, 2 weeks ago

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Okay :)

- 4 months, 2 weeks ago

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I want to join it too!

- 4 months, 2 weeks ago

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There are currently 25 participants and 2-3 people in the waiting list. Low chance that so many people will drop out, but if they do, I'll ping you :)

- 4 months, 2 weeks ago

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@Percy Jackson When will the last two problems be posted?

- 4 months, 1 week ago

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In some time I will post.

- 4 months, 1 week ago

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@Percy Jackson, I think this type of contest would have been better lol

- 4 months ago

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lol I didn't know this existed, thanks for sharing, it is hilarious :P

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Hey Percy, I really appreciate that you're taking the time to make this possible and would very much like to join in. Best, Oskar

- 4 months, 3 weeks ago

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Thanks! I have added you to the contest!!!

- 4 months, 3 weeks ago

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Great, thx!

- 4 months, 3 weeks ago

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