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!

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

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 the levels listed for the given topic.*

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

Calculus - Limits of Sequences: Level 1 and Limits of Functions: Level 1

Computer Science - Complexity/Runtime Analysis: All levels

Happy writing and party on!

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## Comments

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TopNewestHere 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! ;)

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I like your last two problems

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Thank you. Hope more will come. ;)

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Check out my problems :

Geometry : Volume Comparison

Classical Mechanics : Mass- Spring System

Number Theory : No Residue

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

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Thanks, sir !

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Can I invite my friend @John Michael Gogola ? He wants to join.

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Why not

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Thanks :)

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Absolutely!

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More calculus problems for the limits category:

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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...

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Conservation Of Energy

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Andrew Ellinor

Bandrew Melinor

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Haha , nice! :P

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Inspired by You

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Volume - Problem 1 No submission due to practicals.

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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.

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Nice prob

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

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Computer Science: Do you know your sorting?

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

Calculus--limits of fxns:

Algebra--rat'l fxns:

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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

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Here is a rational functions problem I just submitted.

Zeroing Out

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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. ;)

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

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And here it is:

Zeroing Out, part 2

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Here are mine:

Geometry: Divine Conedy

Classical Mechanics: Bob Goes Faster

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Check my geometry problem

Math Before Eat

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Beautiful image. Looks like a prime candidate for a challenge quiz. ;)

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My first problem in this party.

Curious Cuboid

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Haha, what a perfect answer too!

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Calculus - Limits

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

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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.

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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

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Thanks for the info Sir Andrew.

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

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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!

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Thanks and I will work hard!

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I love it

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Thanks!

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Easier than a pentakill

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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.

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

My Set Energy Tranfers .

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

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My problems on Volume:-

Hollow Cone

How much time to fill?

Will try to add more questions.

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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.

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Another problem on Volume by me: Open Box Volume

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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

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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.

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

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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

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My second question here.

Cut Cube

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Excellent! We're featuring your other problem on Facebook soon :)

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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..

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These are PERFECT! Thanks Zeeshan.

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You are welcome :)

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Bingo! Here comes another one ...

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Geometry- Volume : Thick Trick

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Here are my new problems about Algebra-Rational functions:

1, 2, 3, Go!

So close yet so far

Have fun! ;)

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

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My third problem.

Cube In A Cube

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My second problem, RATIONAL FUNCTION

Too Hard?

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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.

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Thx my Friend

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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. ;)

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

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Thanks. Did you solve it yet?

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

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I think because the others is more interesting that Computer Science

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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 ..!

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I think because its not known to many people

eg: me

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Same here, idk what is computer science

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Here are two problems for limits of functions:

How to fix two singularities

Even and odd

(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.)

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

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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

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That's explain why I can't see ur post anymore

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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.

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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! ;)

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Perfect! We need level 1 problems like this. Thanks Dr. Warm.

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You're very welcome, Andrew. ;)

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My fourth problem.

Cubes And Cuboids

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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

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Here is my problem MOMENTUM

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The Momentum Challenge Quiz has already been made.

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Indeed, Rajdeep is correct. The momentum quiz has already been made. But we can possibly find another home for it!

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I've got another problem: Rational? Real! for rational functions -algebra. Hope you enjoy!

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I like it! Definitely a fun problem. We'll probably put it into rational

numbersthough. 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!

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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).

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

My Problems

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@Andrew Ellinor

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

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

Enjoy! ;)

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A new one on Geometry-Volume again: Crystal Clear.

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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?????

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