# Problem Writing Party: May 5th to May 20th

Hello, Brilliant!

Thanks to everyone for your magnificent contributions to the previous problem writing parties.

As always, we're going to continue showing off the hard work these members of the community put in over the last week, so Brilliant will featuring these quizzes in topic listings and social media. Now that those announcements have been made, we're moving on to our seventh Problem Writing Party!

## How it Works

The party starts right now (May 5th, 2016) and will last for the next two weeks. Throughout the two weeks, we will be focusing on writing awesome problems for the topics listed in quizzes that need your help on the publish page.

To join, submit as many problems as you want to these listed topics. At the end of the party, Brilliant staff will be picking the best 5-10 problems for each topic. These problems will then be immortalized and formed into a challenge quiz. If we pick your problem, then you can brag to your friends because it will be displayed on Brilliant forever! Your problem has a better chance of being selected if you include a graphic (when appropriate) and a solution.

## Use this note to

1. Ask questions about the party or brainstorming ideas from Brilliant staff.

2. Share links to great relevant problems.

3. Bounce your ideas off each other to help formulate the best problem you can.

To be selected, problems you submit should be fun and challenging to a student in levels 1-3 for the given topic.

## -------->This Party's Topic Listing<--------

The topics of problem submission for this party can be found by navigating over to the Brilliant publish page and checking under the quizzes that need your help section. Just click the contribute button next to the topic you want make a submission to.

Happy writing and continue to party on!

Note by Sandeep Bhardwaj
3 years, 5 months 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.

MarkdownAppears as
*italics* or _italics_ italics
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- bulleted- list
• bulleted
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1. numbered2. list
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Note: you must add a full line of space before and after lists for them to show up correctly
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[example link](https://brilliant.org)example link
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# 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} $\boxed{123}$

Sort by:

In a room there are 15 switch on a wall out of which only two are fan switch.In how many minimum no of ways a person can find which are the correct switches of each fan.

- 3 years, 5 months ago

Can you post this as a problem?

- 3 years, 5 months ago

105 ways? 15C2

- 3 years, 5 months ago

My entry for floor and ceiling functions I'm floored

And A force of different kind for acceleration , velocity ,displacement

pouring out powers of 2 and 3 for distribution in bins

no. of solutions for graph sketching

- 3 years, 5 months ago

All the problems are great. Thanks for such a wonderful contribution. :)

Hope to get more from you. @neelesh vij

- 3 years, 5 months ago

For introduction to recursion: Calculus and Computer Science Again . I know it's kinda more like for Comp. Sci. but still, it is good practice for recursion.

- 3 years, 5 months ago

- 3 years, 5 months ago

Thanks. c:

- 3 years, 5 months ago

So I'm curious...

When you submit a question, it would be nice to see the "incorrect" answers that are submitted.

That way, if you keep seeing the same "incorrect" answer, you would have an early heads up to either (a) clarify the wording in the question, or (b) update the answer. (Maybe all those answers are correct and its me who goofed up with my answer! :P )

- 3 years, 4 months ago

I agree with you!

- 3 years, 4 months ago

Yeah, I'd hate for great problems to go to waste just because they aren't well explained, or we happened to get the wrong answer in there.

- 3 years, 4 months ago

Same with me

- 3 years, 4 months ago

For example, this question: Guess that number!
39 viewers, 7 attempts and 0 solvers

Given the caliber of 39 random people on Brilliant, I doubt that no one would have solved it.

So, I am wondering whether some of those 7 attempts might actually be correct, but I just goofed up... (Wouldn't be the first time! :P )

And, I figure I need to get it fixed up quickly if so, since the questions have a shelf life of about 3-4 days. If they don't get some kind of action by then, it seems they are very likely to go into the vast wasteland of forgotten questions! :-/

- 3 years, 4 months ago

It is written error 404 cant open. Please use latex for the link. Sorry

- 3 years, 4 months ago

Ooops... There. I fixed it.

- 3 years, 4 months ago

Very good question

- 3 years, 4 months ago

Hey thanks, Prince! :^)

- 3 years, 4 months ago

And please explain how did you get the relation between N H L

- 3 years, 4 months ago

Well I figure every time you take a guess, you divide the problem up into two new problems... One where you reduce your number of "too low" guesses by 1, and one where you reduce your number of "too high" guesses by 1. And, the number of N is either all the ones above your guess or all the ones below your guess. So, the recursive equation can be defined as follows:

Let $N(H,L)$ = The maximum number you can accomplish this in given that you can get only get $H$ "too high"s and $L$ "too low"s, then...

$N(0,L) = L+1$

$N(H,0) = H+1$

$N(H,L) = 1 + N(H-1,L) + N(H,L-1)$

- 3 years, 4 months ago

Okay. Now its clear. Please mention that in original solution too.

- 3 years, 4 months ago

Good suggestion, Prince... Done.

- 3 years, 4 months ago

Oh thanks for the comment☺

- 3 years, 4 months ago

Here is my question too. 45 views 5 attempts 1 solver Log

- 3 years, 4 months ago

OK, I'll take that as a challenge and take a look! :)

- 3 years, 4 months ago

How was the question?

- 3 years, 4 months ago

Haha.... Pretty tough... I'll need to think about it a little more! :)

- 3 years, 4 months ago

If you get it wrong try this. Please do not consider it same. Theres a difference between these

- 3 years, 4 months ago

If you think that the problem needs to be clarified or the given answer is incorrect, then you should report the problem. And the staff can look into the details.

Thanks!

- 3 years, 4 months ago

For logical reasoning topic, we need problems mainly on Truth Seeking subtopic. Thanks!

- 3 years, 5 months ago

This easy problem on floor from my side sir

- 3 years, 5 months ago

To my surprise u have reposted this question sir !!!!!!!!

- 3 years, 5 months ago

@Sandeep Bhardwaj Sir . This is my submission for Truth Seeking subtopic. A total of 6 problems.

- 3 years, 5 months ago

My submissions Math Archive (13)

- 3 years, 5 months ago

Woo hoo... Sounds good! Looking forward to some great problems! :) (I'll try writing some as well)

- 3 years, 5 months ago

Here is my contribution for the acceleration one.

- 3 years, 5 months ago

Here's my entry: Logic-puzzle-Sphinx's Riddle, Who stole my walnuts?, Dark Room Hunt, Cat's Logic

Combinatorics-Distribution to the Bin-Is your date odd or even?, Fruit Lovers.

- 3 years, 5 months ago

2 questions for the topic: Function graphs.

Here and here

- 3 years, 5 months ago

So, should we write new problems for these pages, or use ones we've already published?

- 3 years, 5 months ago

My entries for Logic 1 Logic 2 Logic 3

- 3 years, 5 months ago

This is my new one for Combinatorics-Recurrence Incursion: Wire Hive.

- 3 years, 5 months ago

Here is a question on recursion

- 3 years, 5 months ago

- 3 years, 5 months ago

My first problem here.

- 3 years, 5 months ago

- 3 years, 5 months ago

Here are two submissions for logic: 1) A Murder Mystery Game 2) Alien Abduction Problem

- 3 years, 5 months ago

My entry for Velocity and Acceleration

- 3 years, 5 months ago

Count me in with this classic piece of calculus-1920 Calculus Horror

- 3 years, 5 months ago

Hi Anshuman. Nice problem! You can make your comment formatted more nicely by the following:

$\text{[Paste problem title here](Paste URL link for problem here)}$

Thanks!

- 3 years, 5 months ago

Done Thanks

- 3 years, 5 months ago

My entries will be listed here.

- 3 years, 5 months ago

Nice problem! I hope you to increase the number of entries listed here. ;)

- 3 years, 5 months ago

Thanks. I'll try but still have many exams coming up.

- 3 years, 5 months ago

My submission for curve sketching : Desmos is for donkeys

- 3 years, 5 months ago

Wonderful problem! I loved this problem very much. Thanks for sharing this!

Waiting for more problems. @Rohit Ner

- 3 years, 5 months ago

My entry is for complex numbers: A Problem in Complex Numbers!

- 3 years, 5 months ago

The problem is good. But it is not from the topic listing of this party. Thanks for the problem and I'm excited to get awesome problems from the topic listing for this party.

- 3 years, 5 months ago

I am extremely sorry for the late entry, it is because I have not opened brilliant for a week in between and I just opened today. As I saw the party ends on the day of my last important entrance examination for college. I am posting a problem now, and will be back in the 18th with a lot more.

- 3 years, 5 months ago

You have interchanged the brackets!

- 3 years, 5 months ago

Yea sorry, I forgot all my LateX in all this pressure with the exams. :p

- 3 years, 5 months ago

Great problem! Waiting for more problems as soon as you get done with your exams.

All the best for your exams!

- 3 years, 5 months ago

Parabola : https://brilliant.org/problems/interesting-parabola/

Basics in Area : https://brilliant.org/problems/just-two-lines/

- 3 years, 5 months ago

Here's my new one for Combinatorics-Distribution into Identical Bins: The pawn can't stand alone.

- 3 years, 5 months ago

A great one as usual. ;)

Thanks Dr. Warm! Waiting for more. :P

- 3 years, 5 months ago

Thanks! Looking forward to it, too. 😉

- 3 years, 5 months ago

Here is my question for logic

- 3 years, 5 months ago

Great! Thanks Prince for an awesome problem.

Waiting to see more of your awesome problems. :)

- 3 years, 5 months ago

My problem for combinatorics expected value: A surprising invention. My problem for combinatorics recurrence relations:The Chase of Doom

- 3 years, 5 months ago

Nice problem! @Www Www

You can display the link of your problem by using the syntex: [Name of the problem] (link of the problem) and then your link will be displayed as Name of the problem.

Excited to get more such great problems on your behalf. Thanks!

- 3 years, 5 months ago

THIS is a fresh ceiling problem ;D

- 3 years, 5 months ago

Nice problem, Margaret! Thanks!

Waiting for more from your side. ;)

- 3 years, 5 months ago

Thanks and I will keep working:) My exams are coming up next week so I am trying my best.

- 3 years, 4 months ago

1 2. 2 problems on distances, velocity, acceleration..

- 3 years, 5 months ago

displacement when v=0 problem on displacement and velocity

- 3 years, 5 months ago

My contribution to floor and ceiling functions: A road with holes

- 3 years, 5 months ago

- 3 years, 5 months ago

My submission is "TEDIOUS I"

https://brilliant.org/problems/tedious-i/

- 3 years, 5 months ago

- 3 years, 5 months ago

My submission for decimals. : Working out with decimals!

- 3 years, 5 months ago

My question on floors and ceilings.

- 3 years, 5 months ago

(sine)ing a problem on displacement, acceleration, velocity

- 3 years, 4 months ago

My entry for complex numbers and binomial theorem (I still solve some): Ouch...

- 3 years, 4 months ago

My new one for Function-Graphs: Double Crosses

- 3 years, 4 months ago

Another problem on displacement, velocity, acceleration can u average (sine)ing function?

- 3 years, 4 months ago

Here is my problem on displacement, velocity and acceleration topic - Desing of the car is a wow.

- 3 years, 4 months ago

New one for Combinatorics-Expected value: Double Gamble.

- 3 years, 4 months ago

What is the maximum powers of 2 that 10 raised to 10 can divide without decimals?

- 3 years, 4 months ago

My entry for Floor and Ceiling Functions: That's actually really cool!.

My entry for Decimals: Decimals, Fractions, Scientific Notation and Percentages?!.

- 3 years, 5 months ago