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# Problem Writing Party February 1st - 14th

Hello Brilliant!

Last month's Problem Writing Party was a huge success! So many of you made a contribution one way or another that I couldn't possibly list everyone here. Because of your submissions, we were able to launch not just two new quizzes, but five new quizzes. Here are the quizzes that you all helped create:

New Brilliant Challenge Quizzes
General Polygons: Level 2-3
Number Bases: Level 2
Number Bases: Level 3
Momentum: Level 1-2
Expected Value: Level 2-3

We want to showcase the hard work these members of the community put in over the last week, so Brilliant will featuring these quizzes in the community Featured feed, on Facebook, and in our email campaigns over the next week. With that said, let's kick off the 2nd Problem Writing Party!

## How it Works

The party starts right now (February 1st, 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 below. To participate, 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!

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 the levels listed for the given topic.

## This Party's Topic Listing

The topics of problem submission for this party are below. Just click the topic you want to contribute to.

Geometry - Volume: Level 1-2
Comparing shapes, rearranging 3D figures, playing with volume formulae. Pictures preferred.

Number Theory - Quadratic Residues: Level 3-4
Legendre Symbol, Law of Quadratic Reciprocity, Problem solving, etc.

Combinatorics - Data Presentation: Level 1-2
Data plots, graphs, charts, and misrepresented data.

Classical Mechanics - Conservation of Energy: Level 2-4
Problems that rely on conserving energy from one state to another.

We didn't receive enough problems in these categories last party, so we're asking for your contributions in them again and we've loosened the constraints so that more submissions come in.

Algebra - Rational Functions: Level 1-3

Computer Science - Complexity/Runtime Analysis: All levels

Happy writing and party on!

Note by Andrew Ellinor
10 months, 1 week ago

## Comments

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Top Newest

Here are my questions about Geometry-Volume:

Bar, Ball, Cone

Who wants a scoop?

Pyramid VS Pyramid

5 Pyramids in 1 Cube

Hope you enjoy them! ;) · 10 months, 1 week ago

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I like your last two problems · 10 months, 1 week ago

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Thank you. Hope more will come. ;) · 10 months, 1 week ago

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Yo got that for sure bro! · 10 months, 1 week ago

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Can I invite my friend @John Michael Gogola ? He wants to join. · 10 months ago

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Absolutely! · 10 months ago

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Why not · 10 months ago

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Thanks :) · 10 months ago

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Check out my problems :
Geometry : Volume Comparison
Classical Mechanics : Mass- Spring System
Number Theory : No Residue · 10 months, 1 week ago

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Looking good, Anish! I think we might pick a few of your problems again. · 10 months ago

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Thanks, sir ! · 10 months ago

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Andrew Ellinor
Bandrew Melinor · 9 months, 4 weeks ago

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Haha , nice! :P · 9 months, 4 weeks ago

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Inspired by You · 9 months, 4 weeks ago

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More calculus problems for the limits category:

· 10 months ago

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I like the title for the second one! haha but out of those three, I especially enjoyed "Almost pizza." It might be kind of difficult for level 1, but oh well... · 10 months ago

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A new one on Geometry-Volume again: Crystal Clear. · 9 months, 3 weeks ago

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This is my new question about Geometry-Volume: Crystal in a Cube

Enjoy! ;) · 9 months, 3 weeks ago

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I just want to ask, why geometry only volume.

I got some difficult geometry but it's 2D

Why must 3D, you said you didn't receive enough problem · 9 months, 3 weeks ago

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I am submitting this set of problems for the party :)

My Problems · 9 months, 4 weeks ago

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I have just posted my very first calculus problem: Where does it go? It is an easy but great concept for the beginners (like me). · 9 months, 4 weeks ago

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I've got another problem: Rational? Real! for rational functions -algebra. Hope you enjoy! · 9 months, 4 weeks ago

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I like it! Definitely a fun problem. We'll probably put it into rational numbers though. Rational functions on the other hand are a polynomial divided by a polynomial, such as

$\frac{1}{2x^2 - 5x - 3}, \frac{x^3 - 7x + 6}{x^3 + 6x^2 + 11x + 6}, \frac{3x + 6}{x^2 - 1}$

Fun, right? We'll find a home for this one somewhere. I definitely like Milky and Tricky! · 9 months, 4 weeks ago

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Here is my problem MOMENTUM · 9 months, 4 weeks ago

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Indeed, Rajdeep is correct. The momentum quiz has already been made. But we can possibly find another home for it! · 9 months, 4 weeks ago

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The Momentum Challenge Quiz has already been made. · 9 months, 4 weeks ago

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Another rational function problem--true story. I think it's easy enough for level 1.

Gym grades for second term seniors · 9 months, 4 weeks ago

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My fourth problem.

Cubes And Cuboids · 10 months ago

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This is the question about Calculus-Limits of Functions: Line, Point, Curve.

Probably too easy, but it's level 1, which we needed. So let's give it a try! ;) · 10 months ago

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Perfect! We need level 1 problems like this. Thanks Dr. Warm. · 10 months ago

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You're very welcome, Andrew. ;) · 10 months ago

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Here are two problems for limits of functions:

(I deleted my laser beam problem. Plus, it kept getting marked as "geometry," even though I assure you that NO geometry is needed to solve it. Oh well; it is kind of messy.) · 10 months ago

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Fun problems! I think one of this will land in a new challenge quiz. ;) · 10 months ago

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Thank you! That would be great. :) Here's another limits one that I came up with. It requires just a little more tact: 4, 3, 2, 1, Earth below us · 9 months, 4 weeks ago

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That's explain why I can't see ur post anymore · 10 months ago

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Yes; I deleted it. That's maybe why you had trouble with it as well. Try it out now, if you'd like (and my other problems as well :D).

I really liked your problem, btw. I feel like it should be on a quiz. · 10 months ago

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Why doesn't any one come up with any Computer Science questions.!? :P · 10 months ago

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I think because its not known to many people

eg: me · 10 months ago

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Same here, idk what is computer science · 10 months ago

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I think because the others is more interesting that Computer Science · 10 months ago

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Well.... I don't think so... there are so many hidden genius people with a brilliant mind of computer science (like me of course :) ) here on brilliant.org :P they just need to come up with some new ideas ..! · 10 months ago

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This is my new one for Combinatorics-Data Presentation: Roses are red. Violets are blue..

I hope it's not too easy. ;) · 10 months ago

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God made me pretty , what happened to you? ;) A good problem! · 10 months ago

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Thanks. Did you solve it yet? · 10 months ago

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My second problem, RATIONAL FUNCTION

Too Hard? · 10 months ago

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I like it Jason! This is more Functional Equations. Rational functions deal specifically with a polynomial in the numerator and a polynomial in the denominator, so keep at it. · 10 months ago

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Thx my Friend · 10 months ago

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Comment deleted 10 months ago

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Great problem, I like it · 10 months ago

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Thank you! I hope that it's not too difficult for level 2 or 3. · 10 months ago

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ok I gave up with your problem

it's a little difficult to a level 2 · 10 months ago

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Yes, it might be a level 3, but it's definitely not a level 4 problem. What's giving you trouble? · 10 months ago

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It's a level 3 problem right now but it might go up to level 4. It's computationally cumbersome. · 10 months ago

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i'm not good at calculus, I need to find Rational Function that not using calculus, but using algebra

i'm going to post my algebra rational function

( I fail with your problem ) · 10 months ago

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It's ok, don't worry. I will try out your problem when you post it! · 10 months ago

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i'm still level 2 function · 10 months ago

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did you solve it? Your name has not appeared yet under solvers. I'm sure you could, since all one needs is Pre-Calculus knowledge to solve it · 10 months ago

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i'm not a pro calculus · 10 months ago

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Well, the only calculus knowledge you'll need to know is the first derivative test. I learned that in my Pre-Calculus class two years ago. · 10 months ago

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i'm a level 1 calculus ( I have never learned calculus before ) · 10 months ago

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i even haven't master sin and cosinus · 10 months ago

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don't worry, it's difficult to learn calculus on your own · 10 months ago

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Anyway, check my Rational Function problem !!!

No calculus need, but algebra does

Too Hard ? · 10 months ago

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Nice problem. · 10 months ago

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thx mate · 10 months ago

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My third problem.

Cube In A Cube · 10 months ago

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Here's a new one on Calculus-Limits of Functions: 1, 2, 3 Again. · 10 months ago

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Here are my new problems about Algebra-Rational functions:

1, 2, 3, Go!

So close yet so far

Have fun! ;) · 10 months ago

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Geometry- Volume : Thick Trick · 10 months ago

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I have worked out some problems regarding Complexity/Runtime Analysis, here are they:

I will try to provide problems related to other topics later, Insha.Allah.. · 10 months ago

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These are PERFECT! Thanks Zeeshan. · 10 months ago

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Bingo! Here comes another one ... · 10 months ago

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You are welcome :) · 10 months ago

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My second question here.

Cut Cube · 10 months ago

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Excellent! We're featuring your other problem on Facebook soon :) · 10 months ago

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I just posted a Geometry-Volume problem the "Un-Uniform Sphere". It's maybe a 3 but not a 1! · 10 months ago

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Thanks @W Rose! I'll have a look at it and see if I can find it a home.

Also, you can post links to your problems using the following format
[Un-Uniform Sphere](https://brilliant.org/problems/un-uniform-sphere/)

Like this: Un-Uniform Sphere · 10 months ago

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Here is another geometry/volume problem. Perhaps too hard for level 2, but I'll post it anyway:

Cube & Sphere, Sphere & Cube · 10 months ago

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Oh I think we can find a home for this problem. Your big, bad, binary was hard for the level 3 challenge quiz but we put it in anyway ;)

Thanks Arjen! These are great. · 10 months ago

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My problems on Volume:-

Hollow Cone

How much time to fill?

Will try to add more questions. · 10 months ago

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Beautiful. Thanks, Vighnesh. We might have to make a level 1 and a level 2 challenge quiz for Volume to fit all these questions in. · 10 months ago

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Another problem on Volume by me: Open Box Volume · 10 months ago

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Check my simple , learning and conceptual problems of conservation of energy.

My Set Energy Tranfers . · 10 months ago

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Ohhhh yeah. Some of these will do just fine in the energy quiz. Perfect, Yash. · 10 months ago

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Looks great John! I'm not quite sure which of the chapters it will fit in (out of the chapters listed in the note above), but this might be good for a Euler's Theorem quiz later down the road. · 10 months ago

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I just wrote a funny and easy problem for Geometry- volume: Milky & Tricky Is this good? · 10 months ago

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I love it · 10 months ago

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Thanks! · 10 months ago

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Tricky is right! I like it. This might be our hard level 2 problem. We have so many volume questions pouring in, so this is great! · 10 months ago

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Thanks and I will work hard! · 10 months ago

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Here's my questions about Party's Topic Listing

Geometry- Volume : Archimedes Formula

Geometry- Volume : Thick Trick

Algebra- Rational Function : Rational Function

I will add some more. · 10 months ago

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Hey Brian. In order to get your problem to show up as a link, use the formatting [Archimedes Formula](https://brilliant.org/problems/archimedes-formula/), you can achieve a link like this:

Archimedes Formula · 10 months ago

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Thanks for the info Sir Andrew. · 10 months ago

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Calculus - Limits · 10 months, 1 week ago

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Thanks Sahil! Funny how people can get away without even noticing the floor :P · 10 months ago

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My first problem in this party.

Curious Cuboid · 10 months, 1 week ago

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Haha, what a perfect answer too! · 10 months ago

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Check my geometry problem

Math Before Eat · 10 months, 1 week ago

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Beautiful image. Looks like a prime candidate for a challenge quiz. ;) · 10 months ago

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Here are mine:

Geometry: Divine Conedy

Classical Mechanics: Bob Goes Faster · 10 months, 1 week ago

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Here is a rational functions problem I just submitted.

Zeroing Out · 10 months, 1 week ago

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Appreciated Denton! We were severely lacking in the rational functions category, so your contribution is greatly appreciated. Expect to see your problem in a challenge quiz in a week. ;) · 10 months ago

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And here it is:

Zeroing Out, part 2 · 10 months ago

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Awesome! I'll go create another one in the same category, then. · 10 months ago

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This is what I have so far--there may be more coming.

Calculus--limits of fxns:

Algebra--rat'l fxns:

· 10 months, 1 week ago

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"Too much calculus may put you in the L'Hopital" is the funniest title I've read in a long, long time. Too bad challenge quizzes don't show the title! :P · 10 months ago

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Computer Science: Do you know your sorting? · 10 months, 1 week ago

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@Andrew Ellinor I'm not sure if my problem Confusing Collisions satisfies the above criteria of level 2-4 because it's a very challenging problem, but still I hope there's no harm in submitting. · 10 months, 1 week ago

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There's definitely no harm in submitting! Submit as many problems as you would like. This one looks challenging :) · 10 months ago

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Nice prob · 10 months, 1 week ago

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Volume - Problem 1 No submission due to practicals. · 10 months, 1 week ago

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Can anyone tell me , if I increase a number(say x) by 9 times, the resultant would be 9x or 10x????? · 9 months, 3 weeks ago

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