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

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.*

## 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

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

Computer Science - Complexity/Runtime Analysis: All levels

Happy writing and party on!

## Comments

Sort by:

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! ;) – Worranat Pakornrat · 1 year, 5 months ago

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– Rishabh Sood · 1 year, 5 months ago

I like your last two problemsLog in to reply

– Worranat Pakornrat · 1 year, 5 months ago

Thank you. Hope more will come. ;)Log in to reply

– Rishabh Sood · 1 year, 5 months ago

Yo got that for sure bro!Log in to reply

Can I invite my friend @John Michael Gogola ? He wants to join. – Brian Dela Torre · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

Absolutely!Log in to reply

– Lakshya Sinha · 1 year, 5 months ago

Why notLog in to reply

– John Michael Gogola · 1 year, 5 months ago

Thanks :)Log in to reply

Check out my problems :

Geometry : Volume Comparison

Classical Mechanics : Mass- Spring System

Number Theory : No Residue – Anish Harsha · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

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

– Anish Harsha · 1 year, 5 months ago

Thanks, sir !Log in to reply

Andrew Ellinor

Bandrew Melinor – Rajdeep Dhingra · 1 year, 5 months ago

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– Nihar Mahajan · 1 year, 5 months ago

Haha , nice! :PLog in to reply

– Rajdeep Dhingra · 1 year, 5 months ago

Inspired by YouLog in to reply

Conservation Of Energy – Rajdeep Dhingra · 1 year, 5 months ago

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More calculus problems for the limits category:

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– Jonas Katona · 1 year, 5 months ago

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...Log in to reply

A new one on Geometry-Volume again: Crystal Clear. – Worranat Pakornrat · 1 year, 5 months ago

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

Enjoy! ;) – Worranat Pakornrat · 1 year, 5 months ago

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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 – Jason Chrysoprase · 1 year, 5 months ago

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

My Problems – Pranshu Gaba · 1 year, 5 months 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). – Margaret Zheng · 1 year, 5 months ago

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I've got another problem: Rational? Real! for rational functions -algebra. Hope you enjoy! – Margaret Zheng · 1 year, 5 months ago

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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! – Andrew Ellinor · 1 year, 5 months ago

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Here is my problem MOMENTUM – Akshay Sharma · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

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

– Rajdeep Dhingra · 1 year, 5 months ago

The Momentum Challenge Quiz has already been made.Log in to reply

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

Gym grades for second term seniors – Hobart Pao · 1 year, 5 months ago

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My fourth problem.

Cubes And Cuboids – Lee Care Gene · 1 year, 5 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! ;) – Worranat Pakornrat · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

Perfect! We need level 1 problems like this. Thanks Dr. Warm.Log in to reply

– Worranat Pakornrat · 1 year, 5 months ago

You're very welcome, Andrew. ;)Log in to reply

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.) – Jonas Katona · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

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

4, 3, 2, 1, Earth below us – Jonas Katona · 1 year, 5 months ago

Thank you! That would be great. :) Here's another limits one that I came up with. It requires just a little more tact:Log in to reply

– Jason Chrysoprase · 1 year, 5 months ago

That's explain why I can't see ur post anymoreLog in to reply

I really liked your problem, btw. I feel like it should be on a quiz. – Jonas Katona · 1 year, 5 months ago

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Why doesn't any one come up with any Computer Science questions.!? :P – Zeeshan Ali · 1 year, 5 months ago

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eg: me – Nihar Mahajan · 1 year, 5 months ago

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– Jason Chrysoprase · 1 year, 5 months ago

Same here, idk what is computer scienceLog in to reply

– Jason Chrysoprase · 1 year, 5 months ago

I think because the others is more interesting that Computer ScienceLog in to reply

– Zeeshan Ali · 1 year, 5 months ago

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 ..!Log in to reply

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

I hope it's not too easy. ;) – Worranat Pakornrat · 1 year, 5 months ago

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– Nihar Mahajan · 1 year, 5 months ago

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

– Worranat Pakornrat · 1 year, 5 months ago

Thanks. Did you solve it yet?Log in to reply

My second problem, RATIONAL FUNCTION

Too Hard? – Jason Chrysoprase · 1 year, 5 months ago

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Functional Equations. Rational functions deal specifically with a polynomial in the numerator and a polynomial in the denominator, so keep at it. – Andrew Ellinor · 1 year, 5 months ago

I like it Jason! This is moreLog in to reply

– Jason Chrysoprase · 1 year, 5 months ago

Thx my FriendLog in to reply

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– Jason Chrysoprase · 1 year, 5 months ago

Great problem, I like itLog in to reply

– Jonas Katona · 1 year, 5 months ago

Thank you! I hope that it's not too difficult for level 2 or 3.Log in to reply

it's a little difficult to a level 2 – Jason Chrysoprase · 1 year, 5 months ago

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– Jonas Katona · 1 year, 5 months ago

Yes, it might be a level 3, but it's definitely not a level 4 problem. What's giving you trouble?Log in to reply

– Andrew Ellinor · 1 year, 5 months ago

It's a level 3 problem right now but it might go up to level 4. It's computationally cumbersome.Log in to reply

i'm going to post my algebra rational function

( I fail with your problem ) – Jason Chrysoprase · 1 year, 5 months ago

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– Jonas Katona · 1 year, 5 months ago

It's ok, don't worry. I will try out your problem when you post it!Log in to reply

– Jason Chrysoprase · 1 year, 5 months ago

i'm still level 2 functionLog in to reply

– Jonas Katona · 1 year, 5 months ago

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 itLog in to reply

– Jason Chrysoprase · 1 year, 5 months ago

i'm not a pro calculusLog in to reply

– Jonas Katona · 1 year, 5 months ago

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.Log in to reply

– Jason Chrysoprase · 1 year, 5 months ago

i'm a level 1 calculus ( I have never learned calculus before )Log in to reply

– Jason Chrysoprase · 1 year, 5 months ago

i even haven't master sin and cosinusLog in to reply

– Jonas Katona · 1 year, 5 months ago

don't worry, it's difficult to learn calculus on your ownLog in to reply

No calculus need, but algebra does

Too Hard ? – Jason Chrysoprase · 1 year, 5 months ago

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– Harsh Shrivastava · 1 year, 5 months ago

Nice problem.Log in to reply

– Jason Chrysoprase · 1 year, 5 months ago

thx mateLog in to reply

My third problem.

Cube In A Cube – Lee Care Gene · 1 year, 5 months ago

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Here's a new one on Calculus-Limits of Functions: 1, 2, 3 Again. – Worranat Pakornrat · 1 year, 5 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! ;) – Worranat Pakornrat · 1 year, 5 months ago

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Geometry- Volume : Thick Trick – Brian Dela Torre · 1 year, 5 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.. – Zeeshan Ali · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

These are PERFECT! Thanks Zeeshan.Log in to reply

Bingo! Here comes another one ... – Zeeshan Ali · 1 year, 5 months ago

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– Zeeshan Ali · 1 year, 5 months ago

You are welcome :)Log in to reply

My second question here.

Cut Cube – Lee Care Gene · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

Excellent! We're featuring your other problem on Facebook soon :)Log in to reply

I just posted a Geometry-Volume problem the "Un-Uniform Sphere". It's maybe a 3 but not a 1! – W Rose · 1 year, 5 months ago

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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 – Andrew Ellinor · 1 year, 5 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 – Arjen Vreugdenhil · 1 year, 5 months ago

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Thanks Arjen! These are great. – Andrew Ellinor · 1 year, 5 months ago

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My problems on Volume:-

Hollow Cone

How much time to fill?

Will try to add more questions. – Vignesh Rao · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

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.Log in to reply

Open Box Volume – Vignesh Rao · 1 year, 5 months ago

Another problem on Volume by me:Log in to reply

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

My Set Energy Tranfers . – Yash Dev Lamba · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

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

Easier than a pentakill – John Michael Gogola · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

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.Log in to reply

I just wrote a funny and easy problem for Geometry- volume: Milky & Tricky Is this good? – Margaret Zheng · 1 year, 5 months ago

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– Jason Chrysoprase · 1 year, 5 months ago

I love itLog in to reply

– Margaret Zheng · 1 year, 5 months ago

Thanks!Log in to reply

– Andrew Ellinor · 1 year, 5 months ago

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!Log in to reply

– Margaret Zheng · 1 year, 5 months ago

Thanks and I will work hard!Log in to reply

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. – Brian Dela Torre · 1 year, 5 months ago

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`[Archimedes Formula](https://brilliant.org/problems/archimedes-formula/)`

, you can achieve a link like this:Archimedes Formula – Andrew Ellinor · 1 year, 5 months ago

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– Brian Dela Torre · 1 year, 5 months ago

Thanks for the info Sir Andrew.Log in to reply

Calculus - Limits – Sahil Bansal · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

Thanks Sahil! Funny how people can get away without even noticing the floor :PLog in to reply

My first problem in this party.

Curious Cuboid – Lee Care Gene · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

Haha, what a perfect answer too!Log in to reply

Check my geometry problem

Math Before Eat – Jason Chrysoprase · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

Beautiful image. Looks like a prime candidate for a challenge quiz. ;)Log in to reply

Here are mine:

Geometry: Divine Conedy

Classical Mechanics: Bob Goes Faster – Arjen Vreugdenhil · 1 year, 5 months ago

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Here is a rational functions problem I just submitted.

Zeroing Out – Denton Young · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

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. ;)Log in to reply

Zeroing Out, part 2 – Denton Young · 1 year, 5 months ago

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– Denton Young · 1 year, 5 months ago

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

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

Calculus--limits of fxns:

Algebra--rat'l fxns:

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– Andrew Ellinor · 1 year, 5 months ago

"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! :PLog in to reply

Computer Science: Do you know your sorting? – Agnishom Chattopadhyay · 1 year, 5 months 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. – Ishan Dasgupta Samarendra · 1 year, 5 months ago

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– Andrew Ellinor · 1 year, 5 months ago

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

– Lakshya Sinha · 1 year, 5 months ago

Nice probLog in to reply

Volume - Problem 1 No submission due to practicals. – Sachin Vishwakarma · 1 year, 5 months 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????? – Ayush Pattnayak · 1 year, 5 months ago

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