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

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

Share links to great relevant problems.

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!

## Comments

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TopNewestIn 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. – Nikhil Ahluwalia · 1 year, 2 months ago

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– Sandeep Bhardwaj · 1 year, 2 months ago

Can you post this as a problem?Log in to reply

– Ishan Pradhan · 1 year, 2 months ago

105 ways? 15C2Log in to reply

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 ) – Geoff Pilling · 1 year, 2 months ago

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– Prince Loomba · 1 year, 2 months ago

I agree with you!Log in to reply

– Geoff Pilling · 1 year, 2 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.Log in to reply

– Prince Loomba · 1 year, 2 months ago

Same with meLog in to reply

Guess that number!

For example, this question: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! :-/ – Geoff Pilling · 1 year, 2 months ago

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– Prince Loomba · 1 year, 2 months ago

It is written error 404 cant open. Please use latex for the link. SorryLog in to reply

– Geoff Pilling · 1 year, 2 months ago

Ooops... There. I fixed it.Log in to reply

– Prince Loomba · 1 year, 2 months ago

Very good questionLog in to reply

– Geoff Pilling · 1 year, 2 months ago

Hey thanks, Prince! :^)Log in to reply

– Prince Loomba · 1 year, 2 months ago

And please explain how did you get the relation between N H LLog in to reply

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...

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

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

\(N(H,L) = 1 + N(H-1,L) + N(H,L-1)\) – Geoff Pilling · 1 year, 2 months ago

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– Prince Loomba · 1 year, 2 months ago

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

– Geoff Pilling · 1 year, 2 months ago

Good suggestion, Prince... Done.Log in to reply

Log – Prince Loomba · 1 year, 2 months ago

Here is my question too. 45 views 5 attempts 1 solverLog in to reply

– Geoff Pilling · 1 year, 2 months ago

OK, I'll take that as a challenge and take a look! :)Log in to reply

– Prince Loomba · 1 year, 2 months ago

How was the question?Log in to reply

– Geoff Pilling · 1 year, 2 months ago

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

this. Please do not consider it same. Theres a difference between these – Prince Loomba · 1 year, 2 months ago

If you get it wrong tryLog in to reply

– Prince Loomba · 1 year, 2 months ago

Oh thanks for the comment☺Log in to reply

@Geoff Pilling

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! – Sandeep Bhardwaj · 1 year, 2 months ago

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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. – Kunal Verma · 1 year, 2 months ago

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– Hung Woei Neoh · 1 year, 2 months ago

Your link is placed wrongly. [word] followed by (website link)Log in to reply

– Kunal Verma · 1 year, 2 months ago

Thanks. c:Log in to reply

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 – Neelesh Vij · 1 year, 2 months ago

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Hope to get more from you. @neelesh vij – Sandeep Bhardwaj · 1 year, 2 months ago

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What is the maximum powers of 2 that 10 raised to 10 can divide without decimals? – Lance Fernando · 1 year, 2 months ago

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New one for Combinatorics-Expected value: Double Gamble. – Worranat Pakornrat · 1 year, 2 months ago

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Here is my problem on displacement, velocity and acceleration topic - Desing of the car is a wow. – Sandeep Bhardwaj · 1 year, 2 months ago

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Another problem on displacement, velocity, acceleration can u average (sine)ing function? – Sparsh Sarode · 1 year, 2 months ago

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My new one for Function-Graphs: Double Crosses – Worranat Pakornrat · 1 year, 2 months ago

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My entry for complex numbers and binomial theorem (I still solve some): Ouch... – 敬全 钟 · 1 year, 2 months ago

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(sine)ing a problem on displacement, acceleration, velocity – Sparsh Sarode · 1 year, 2 months ago

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My question on floors and ceilings.

Don't Get Confused! – Lee Care Gene · 1 year, 2 months ago

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My submission for decimals. : Working out with decimals! – Miraj Shah · 1 year, 2 months ago

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A graph problem – Prince Loomba · 1 year, 2 months ago

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My submission is "TEDIOUS I"

https://brilliant.org/problems/tedious-i/ – Aakash Khandelwal · 1 year, 2 months ago

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An interesting logic problem,a challenging one – Prince Loomba · 1 year, 2 months ago

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My contribution to floor and ceiling functions: A road with holes – Rohit Ner · 1 year, 2 months ago

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displacement when v=0 problem on displacement and velocity – Sparsh Sarode · 1 year, 2 months ago

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1 2. 2 problems on distances, velocity, acceleration.. – Sparsh Sarode · 1 year, 2 months ago

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THIS is a fresh ceiling problem ;D – Margaret Zheng · 1 year, 2 months ago

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Waiting for more from your side. ;) – Sandeep Bhardwaj · 1 year, 2 months ago

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– Margaret Zheng · 1 year, 2 months ago

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

My problem for combinatorics expected value: A surprising invention. My problem for combinatorics recurrence relations:The Chase of Doom – Www Www · 1 year, 2 months ago

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@Www Www

Nice problem!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! – Sandeep Bhardwaj · 1 year, 2 months ago

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Here is my question for logic – Prince Loomba · 1 year, 2 months ago

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Waiting to see more of your awesome problems. :) – Sandeep Bhardwaj · 1 year, 2 months ago

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Here's my new one for Combinatorics-Distribution into Identical Bins: The pawn can't stand alone. – Worranat Pakornrat · 1 year, 2 months ago

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Thanks Dr. Warm! Waiting for more. :P – Sandeep Bhardwaj · 1 year, 2 months ago

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– Worranat Pakornrat · 1 year, 2 months ago

Thanks! Looking forward to it, too. 😉Log in to reply

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

Basics in Area : https://brilliant.org/problems/just-two-lines/ – Akash Shukla · 1 year, 2 months ago

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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.

Weigh it out

Unique Decimal

On function graphs – Soumava Pal · 1 year, 2 months ago

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@Soumava Pal

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

All the best for your exams! – Sandeep Bhardwaj · 1 year, 2 months ago

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– Prince Loomba · 1 year, 2 months ago

You have interchanged the brackets!Log in to reply

– Soumava Pal · 1 year, 2 months ago

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

My entry is for complex numbers: A Problem in Complex Numbers! – Miraj Shah · 1 year, 2 months ago

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topic listing of this party. Thanks for the problem and I'm excited to get awesome problems from the topic listing for this party. – Sandeep Bhardwaj · 1 year, 2 months ago

The problem is good. But it is not from theLog in to reply

My submission for curve sketching : Desmos is for donkeys – Rohit Ner · 1 year, 2 months ago

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Waiting for more problems. @Rohit Ner – Sandeep Bhardwaj · 1 year, 2 months ago

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My entries will be listed here.

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– Sandeep Bhardwaj · 1 year, 2 months ago

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

– Hobart Pao · 1 year, 2 months ago

Thanks. I'll try but still have many exams coming up.Log in to reply

Count me in with this classic piece of calculus-1920 Calculus Horror – Anshuman Bais · 1 year, 2 months ago

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

Thanks! – Hobart Pao · 1 year, 2 months ago

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– Anshuman Bais · 1 year, 2 months ago

Done ThanksLog in to reply

My entry for Velocity and Acceleration – Joao Miguel Coelho · 1 year, 2 months ago

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Here are two submissions for logic: 1) A Murder Mystery Game 2) Alien Abduction Problem – Kunal Verma · 1 year, 2 months ago

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Who can swim? – Vee Zhi · 1 year, 2 months ago

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My first problem here.

Decimals Warmup – Lee Care Gene · 1 year, 2 months ago

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a problem about decimals – Margaret Zheng · 1 year, 2 months ago

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Here is a question on recursion – Prince Loomba · 1 year, 2 months ago

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This is my new one for Combinatorics-Recurrence Incursion: Wire Hive. – Worranat Pakornrat · 1 year, 2 months ago

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My entries for Logic 1 Logic 2 Logic 3 – Geoff Pilling · 1 year, 2 months ago

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So, should we write new problems for these pages, or use ones we've already published? – Geoff Pilling · 1 year, 2 months ago

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2 questions for the topic: Function graphs.

Here and here – Hung Woei Neoh · 1 year, 2 months ago

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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. – Worranat Pakornrat · 1 year, 2 months ago

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Here is my contribution for the acceleration one. – Tanishq Varshney · 1 year, 2 months ago

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Woo hoo... Sounds good! Looking forward to some great problems! :) (I'll try writing some as well) – Geoff Pilling · 1 year, 2 months ago

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My submissions Math Archive (13)

Math Archive (14) – Shivam Jadhav · 1 year, 2 months ago

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For logical reasoning topic, we need problems mainly on

Truth Seekingsubtopic. Thanks! – Sandeep Bhardwaj · 1 year, 2 months agoLog in to reply

This easy problem on floor from my side sir – Gauri shankar Mishra · 1 year, 2 months ago

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– Gauri shankar Mishra · 1 year, 2 months ago

To my surprise u have reposted this question sir !!!!!!!!Log in to reply

@Sandeep Bhardwaj Sir . This is my submission for

Truth Seekingsubtopic. A total of 6 problems. – Abhay Tiwari · 1 year, 2 months agoLog in to reply

A hard logic puzzle – Prince Loomba · 1 year, 2 months ago

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

My entry for Decimals: Decimals, Fractions, Scientific Notation and Percentages?!. – Sharky Kesa · 1 year, 2 months ago

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