Hello Brilliant!

Once more, Problem Writing Party number 5 was a record breaking success: this time we made **nine** new quizzes! Here are the quizzes that you all helped create:

New Brilliant Challenge Quizzes

Simple Harmonic Motion: Level 2-3

Simple Harmonic Motion: Level 4-5

Functions: Level 3

Functions: Level 4

Functions: Level 5

2D Coordinate Geometry: Level 3

2D Coordinate Geometry: Level 4

2D Coordinate Geometry: Level 5

Capacitors and Transformers: Level 2-3

We're going to show off all the hard work these members of the community put in over the last week. Continue submitting your fantastic problems as we kick off our **sixth** Problem Writing Party!

## How it Works

The party starts right now (March 28th, 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 to make a submission to.

Happy writing and keep the party alive!

## Comments

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TopNewestHere's my freshly made problem on Geometry-Similar Polygon: The Lightning Scar.

Do you know the secrets behind Harry Potter's lightning scar? ;) – Worranat Pakornrat · 9 months, 4 weeks ago

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– Hobart Pao · 9 months, 3 weeks ago

Very creative! (+1)Log in to reply

– Worranat Pakornrat · 9 months, 3 weeks ago

Thanks! Do you read Harry Potter as well? ;)Log in to reply

– Hobart Pao · 9 months, 3 weeks ago

A long time ago! I used to be obsessed with it.Log in to reply

– Worranat Pakornrat · 9 months, 3 weeks ago

Well, then this is the chance for you to find the last and the most powerful Hallow. Lol...Log in to reply

P.S: I hope you understand why I used "curious" :P – Sravanth Chebrolu · 9 months, 3 weeks ago

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– Worranat Pakornrat · 9 months, 3 weeks ago

Is that the quote from one of the characters? Hm...curious...curious...;)Log in to reply

– Sravanth Chebrolu · 9 months, 3 weeks ago

Mr. OlivanderLog in to reply

– Worranat Pakornrat · 9 months, 3 weeks ago

Ah...I see but he already played his part in the Elder Wand already. Now we're looking for the spear wielder. LOL...Log in to reply

This is my contribution for this party, will be posting more, hope it helps!

2D Kinematics: Motion Graphs.

2D Kinematics: Graphs Help Us a Lot.

Similar Polygons: Are you economic with the pizzas?.

Similar Polygons: Are they Similar?.

Magnetic Fields: Find your Poles.

Magnetic Fields: Does it matter?.

Volume of Revolution: Rotate that Function.

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

All the problems are wonderful. It seems that every problem is capable of making its way to the quiz. Thanks Sravanth for such great problems!Log in to reply

this. – Sravanth Chebrolu · 9 months, 3 weeks ago

Thanks sir! Here's one more:Log in to reply

Here is a problem on Discrete Probability : Sandeep tosses a coin !.

Look at this problem too on Symmetric Polynomials : Is it really a Symmetry ?. – Anish Harsha · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

Very nice problems Anish! Thanks :)Log in to reply

– Anish Harsha · 9 months, 3 weeks ago

Thanks, sir. I dedicate the 1st problem to you ! :)Log in to reply

Let's Disc, Bros !, on the topic, Volume of Revolution- Calculus. – Anish Harsha · 9 months, 3 weeks ago

Also, see my new problem,Log in to reply

As for the final day of this party, I present to you, Algebra-Symmetrical Polynomials: Inverse of Inverses.

Enjoy! – Worranat Pakornrat · 9 months, 2 weeks ago

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i have already added.. hope you will like to add. simple harmonic motion level 4 – Aman Rajput · 9 months, 2 weeks ago

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– Sandeep Bhardwaj · 9 months, 2 weeks ago

Interesting, thanks! :)Log in to reply

For the special event of my 101 followers, I present my new question on Geometry-Similar Polygons: 101 Followers Question by Dr. Warm.

Hope you guys would like it! ;) – Worranat Pakornrat · 9 months, 2 weeks ago

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– Sandeep Bhardwaj · 9 months, 2 weeks ago

Congratulations for grabbing 101 followers. Nice problem Dr. Warm. :)Log in to reply

– Worranat Pakornrat · 9 months, 2 weeks ago

Thanks a lot, Sandeep! ;)Log in to reply

This is my new question on Algebra-Symmetrical Polynomial: Prime, Prime, Prime.

Enjoy! ;) – Worranat Pakornrat · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 2 weeks ago

Enjoying :)Log in to reply

This is my new question on Geometry-Similar Polygons: Half, Half, Half.

Hope it's not too simple. ;) – Worranat Pakornrat · 9 months, 3 weeks ago

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– Sravanth Chebrolu · 9 months, 3 weeks ago

Posted the solution too ;)Log in to reply

– Worranat Pakornrat · 9 months, 3 weeks ago

Saw it. You're so quick! ;)Log in to reply

This will be updated as necessary.

Volume of revolution:

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

Great great great problems. Thanks!Log in to reply

– Hobart Pao · 9 months, 3 weeks ago

Thanks!Log in to reply

These are the questions in my stock:

Calculus-Volume of Revolution: Sand of Time.

Combinatorics-Probability: Hit the Jackpot! ; Crispy ABC and Fighting Fish. – Worranat Pakornrat · 9 months, 4 weeks ago

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– Sandeep Bhardwaj · 9 months, 4 weeks ago

How did you get such an awesome stock? ;)Log in to reply

– Worranat Pakornrat · 9 months, 4 weeks ago

I created it day by day. Gradually they filled up the whole stock. ;)Log in to reply

– Hobart Pao · 9 months, 4 weeks ago

I saw Sand of Time before...Log in to reply

– Worranat Pakornrat · 9 months, 4 weeks ago

Oh, really? I thought it'd fit the topic, so I put it here.Log in to reply

Here are some problems by Prakhar Bindal on 2D Kinematics:

Recolllect the past 1

Recollect the past 2

Recollect the past 3

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@Prakhar Bindal I've collected your problems in my comment. And you can check out the latex syntax to add the link of a problem here in the comments. Thanks for the nice problems! :) – Sandeep Bhardwaj · 9 months, 4 weeks ago

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– Prakhar Bindal · 9 months, 4 weeks ago

Thanks a lotLog in to reply

When is the next party coming? – Lee Care Gene · 9 months, 1 week ago

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– Andrew Ellinor · 9 months, 1 week ago

Currently planning a new type of party and redesigning this one :)Log in to reply

My problem on 2D Geometry : Tangents at parabola – Vatsalya Tandon · 9 months, 1 week ago

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– Sandeep Bhardwaj · 9 months, 1 week ago

Great! Thanks for the contribution. However, this party has been over, you can participate in the upcoming parties. :)Log in to reply

– Vatsalya Tandon · 9 months, 1 week ago

Ok Sir :)Log in to reply

@Sandeep Bhardwaj sir – Prakhar Bindal · 9 months, 1 week ago

From where can i know that my problem has been shortlisted for quizzes or not?Log in to reply

– Sandeep Bhardwaj · 9 months, 1 week ago

You can click on the quizzes mentioned in the note and check out whether your problem has been selected. Remember that the mentioned quizzes are from the previous problem writing party.Log in to reply

Here is a problem on Discrete Probability – Soumava Pal · 9 months, 2 weeks ago

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– Sandeep Bhardwaj · 9 months, 2 weeks ago

Amazing problem. Thanks! :)Log in to reply

– 展豪 張 · 9 months, 2 weeks ago

Nice extension of a classical problem!Log in to reply

– Soumava Pal · 9 months, 2 weeks ago

Thanks. :)Log in to reply

Here is next part of my problems on 2d kinematics

Recollect the past 7 ! – Prakhar Bindal · 9 months, 2 weeks ago

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Here is another of my problems on Similarity. – Soumava Pal · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 2 weeks ago

Thanks for the contribution. :)Log in to reply

– Soumava Pal · 9 months, 2 weeks ago

Thank you, sir!Log in to reply

@Sandeep Bhardwaj sir why am i not able to see ratings of problems only level appears – Prakhar Bindal · 9 months, 2 weeks ago

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– Sandeep Bhardwaj · 9 months, 2 weeks ago

Because no one can see the ratings now. Brilliant doesn't display the ratings anymore. Only level appears for a problem. Enjoy with that. :)Log in to reply

– Prakhar Bindal · 9 months, 2 weeks ago

okLog in to reply

Here is my first contribution for Discrete Probability:How many balls?

Though its easy, I will be posting some new good problems soon. – Yash Jain · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

Good problem. Thanks!Log in to reply

Here are three problems for Similar Polygon Geometry: It may be Hard to Notice, Not Hard to Imagine and Can you Solve this Without Trig? – Hjalmar Orellana Soto · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

Amazing problems. I liked 3rd one the most. Thanks! Keep posting ;)Log in to reply

Volume of Revolution – Hjalmar Orellana Soto · 9 months, 3 weeks ago

One more forLog in to reply

Been some time since I last posted a question. Anyway, here is a question for similar polygons.

Tricky Triangles – Lee Care Gene · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

The trick is tricky. ;)Log in to reply

Here's my new entry on Calculus-Volume by Revolution: Who ate that apple?. – Worranat Pakornrat · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

Yes, Dr. Warm ate it. Anyway, thanks!Log in to reply

– Worranat Pakornrat · 9 months, 3 weeks ago

Yum! Yum! You're welcome! ;)Log in to reply

Here's my submission:

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

What a lovely couple of problems! Thanks :)Log in to reply

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

Great!Log in to reply

Maybe this old problem of mine would be useful for discrete probability:

Good Car, Bad Car – Gian Tuazon · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

The car in the image is definitely a bad car. But the problem is good. ;) Thanks!Log in to reply

Filling up Spheres: This is an old problem, and is not just about solids of revolution. I hope this can do, though. :) – Efren Medallo · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

There should be a fish in the tank. Nice problem, thanks! ;)Log in to reply

Now it's time for Algebra-Symmetrical Polynomials: Squares In Between.

Hint: the solution is also symmetrical. ;) – Worranat Pakornrat · 9 months, 3 weeks agoLog in to reply

– Sandeep Bhardwaj · 9 months, 2 weeks ago

Perfect symmetry! ;)Log in to reply

Here Are Some more problems on 2 - D Kinematics

Recollect the past 4 ! Recollect the past 5 ! Recollect the past 6 !

I Request @Sandeep Bhardwaj sir to add these problems too to his previous comment – Prakhar Bindal · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

Just awesome!Log in to reply

– Prakhar Bindal · 9 months, 3 weeks ago

sir i am not able to see points a problem corresponds to only the level of problem is visible . can you help?Log in to reply

@Prakhar Bindal – Sandeep Bhardwaj · 9 months, 2 weeks ago

Brilliant doesn't display the points of a problem anymore. Only the level is displayed. So, enjoy with the level itself. ;)Log in to reply

Here is a problem on Similarity – Soumava Pal · 9 months, 3 weeks ago

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Before

After

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@Andrew Ellinor

I am redrawing it right away Sir. :D – Soumava Pal · 9 months, 3 weeks ago

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– Andrew Ellinor · 9 months, 3 weeks ago

Thanks!Log in to reply

@Andrew Ellinor – Soumava Pal · 9 months, 3 weeks ago

Is it okay now?Log in to reply

– Andrew Ellinor · 9 months, 3 weeks ago

Much, MUCH better Soumava. Thanks! Looks great now.Log in to reply

– Soumava Pal · 9 months, 3 weeks ago

Thank you sir. :)Log in to reply

– Soumava Pal · 9 months, 3 weeks ago

:)Log in to reply

Here is the set of few computer science problems on Linear Data Structures – Zeeshan Ali · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

Very smart set! Thanks :)Log in to reply

Here's my submission to the party . I will post more soon.

\(\mathbf{Kinematics}\implies\) Drive Fast ! – Aditya Sharma · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

Nice problem. Drive fast, but don't cross the limit. ;) Thanks!Log in to reply

– Aditya Sharma · 9 months, 3 weeks ago

Hehe thanks sir! . I will be updating more.Log in to reply

Hope you like this one Find out the range! – Abhishek Chopra · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

Looks difficult to me. BTW nice one. Thanks! ;)Log in to reply

Here's some problems :- Look at the constant term, Indeed Lengthy !, Will you find the value of roots – Aditya Sky · 9 months, 3 weeks ago

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@Aditya Sky Your problems are great. Can you post such wonderful problems from the topics selected for this party? – Sandeep Bhardwaj · 9 months, 2 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

A colorful set of problems. It would be great if you could post such amazing problems from the topics selected for this party. Thanks ;)Log in to reply

Here is my entry for Discrete Probability:

Biased Coin

Similar Polygons:

Harry Potter and Sphere – 展豪 張 · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

Great, thanks! :)Log in to reply

– 展豪 張 · 9 months, 3 weeks ago

Are they too easy? ;)Log in to reply

– Sandeep Bhardwaj · 9 months, 3 weeks ago

Not too easy. The problems are of intermediate level I guess. :) Keep it up!Log in to reply

– 展豪 張 · 9 months, 3 weeks ago

I will work hard to create some harder problems(maybe level 5) ;)Log in to reply

Guys..Try out these questions in my stock with solutions. I did not get proper responses.

Algebra - Government Budget, Mushrooms,Khan the Barber,Financial Gain – Ashwin K · 9 months, 3 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

Problems are nice but quite apart from the topics of the party. Well, thanks and waiting for the party problems. :)Log in to reply

Here is another problem How many points to qualify? – Abhishek Chopra · 9 months, 4 weeks ago

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the topics for this week's problem writing party though? – Andrew Ellinor · 9 months, 4 weeks ago

Great problem Abhishek! Do you have any questions that pertain toLog in to reply

Here's my entry A force of different kind – Neelesh Vij · 9 months, 4 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

The equation of force is of different kind. Thanks! :)Log in to reply

Symmetric Polynomial

Insanely Huge Symmetric Polynomial – Svatejas Shivakumar · 9 months, 4 weeks ago

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– Sandeep Bhardwaj · 9 months, 3 weeks ago

haha, great problems. Thanks :)Log in to reply

P.S. great question indeed. – Neelesh Vij · 9 months, 3 weeks ago

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– Svatejas Shivakumar · 9 months, 3 weeks ago

Actually I did a mistake in my calculation and the answer to the second part is wrong. Extremely sorry.Log in to reply

– Neelesh Vij · 9 months, 3 weeks ago

Nevermind that, it happens with me also.Log in to reply

– Svatejas Shivakumar · 9 months, 3 weeks ago

The problem is correct now.Log in to reply

Here is my contribution in 2D Kinematics : Collision in mid-air! – Sahil Bansal · 9 months, 4 weeks ago

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– Sandeep Bhardwaj · 9 months, 4 weeks ago

Great problem! Thanks :)Log in to reply

I Have a hell lot of nice problem of 2D Kinematics (Atleast 100).

I Will be posting the best of them soon – Prakhar Bindal · 9 months, 4 weeks ago

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– Sandeep Bhardwaj · 9 months, 4 weeks ago

That's great! I'm waiting for your nice problems.Log in to reply

– Prakhar Bindal · 9 months, 4 weeks ago

I Have posted 2 of themLog in to reply

– Sandeep Bhardwaj · 9 months, 4 weeks ago

You can post the links of the problems you post here in the comment box. Thanks! :)Log in to reply

https://brilliant.org/problems/recollect-the-past-2/?ref_id=1156260

https://brilliant.org/problems/recollect-the-past-3/?ref_id=1156284 – Prakhar Bindal · 9 months, 4 weeks ago

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\[\text{[Name of the problem](link)}\]

And it will appear as Name of the problem. – Sandeep Bhardwaj · 9 months, 4 weeks ago

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Here comes my first one: Andlew's three symmetric numbers

Contributed before Dr. Warm. Mission accomplished. – Nihar Mahajan · 9 months, 4 weeks ago

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@Nihar Mahajan? ;) – Worranat Pakornrat · 9 months, 4 weeks ago

Oh, no...how could you,Log in to reply

– Sandeep Bhardwaj · 9 months, 4 weeks ago

Nice problem, Nihar! Thanks :)Log in to reply