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Problem Writing Party: May 5th to May 20th

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

  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 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!

Note by Sandeep Bhardwaj
7 months ago

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In 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 · 6 months, 4 weeks ago

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@Nikhil Ahluwalia Can you post this as a problem? Sandeep Bhardwaj · 6 months, 3 weeks ago

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@Nikhil Ahluwalia 105 ways? 15C2 Ishan Pradhan · 6 months, 3 weeks ago

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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 · 6 months, 2 weeks ago

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@Geoff Pilling I agree with you! Prince Loomba · 6 months, 2 weeks ago

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@Prince Loomba 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. Geoff Pilling · 6 months, 2 weeks ago

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@Geoff Pilling Same with me Prince Loomba · 6 months, 2 weeks ago

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@Prince Loomba For example, this question: Guess that number!
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 · 6 months, 2 weeks ago

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@Geoff Pilling It is written error 404 cant open. Please use latex for the link. Sorry Prince Loomba · 6 months, 2 weeks ago

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@Prince Loomba Ooops... There. I fixed it. Geoff Pilling · 6 months, 2 weeks ago

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@Geoff Pilling Very good question Prince Loomba · 6 months, 2 weeks ago

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@Prince Loomba Hey thanks, Prince! :^) Geoff Pilling · 6 months, 2 weeks ago

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@Geoff Pilling And please explain how did you get the relation between N H L Prince Loomba · 6 months, 2 weeks ago

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@Prince Loomba Well I figure every time you take a guess, you divide the problem up into two new problems... One where you reduce your number of "too low" guesses by 1, and one where you reduce your number of "too high" guesses by 1. And, the number of N is either all the ones above your guess or all the ones below your guess. So, the recursive equation can be defined as follows:

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 · 6 months, 2 weeks ago

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@Geoff Pilling Okay. Now its clear. Please mention that in original solution too. Prince Loomba · 6 months, 2 weeks ago

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@Prince Loomba Good suggestion, Prince... Done. Geoff Pilling · 6 months, 2 weeks ago

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@Geoff Pilling Here is my question too. 45 views 5 attempts 1 solver Log Prince Loomba · 6 months, 2 weeks ago

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@Prince Loomba OK, I'll take that as a challenge and take a look! :) Geoff Pilling · 6 months, 2 weeks ago

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@Geoff Pilling How was the question? Prince Loomba · 6 months, 2 weeks ago

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@Prince Loomba Haha.... Pretty tough... I'll need to think about it a little more! :) Geoff Pilling · 6 months, 2 weeks ago

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@Geoff Pilling If you get it wrong try this. Please do not consider it same. Theres a difference between these Prince Loomba · 6 months, 2 weeks ago

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@Geoff Pilling Oh thanks for the comment☺ Prince Loomba · 6 months, 2 weeks ago

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@Geoff Pilling @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 · 6 months, 2 weeks 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 · 6 months, 4 weeks ago

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@Kunal Verma Your link is placed wrongly. [word] followed by (website link) Hung Woei Neoh · 6 months, 4 weeks ago

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@Hung Woei Neoh Thanks. c: Kunal Verma · 6 months, 4 weeks ago

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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 · 7 months ago

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@Neelesh Vij All the problems are great. Thanks for such a wonderful contribution. :)

Hope to get more from you. @neelesh vij Sandeep Bhardwaj · 6 months, 3 weeks ago

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What is the maximum powers of 2 that 10 raised to 10 can divide without decimals? Lance Fernando · 6 months, 2 weeks ago

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New one for Combinatorics-Expected value: Double Gamble. Worranat Pakornrat · 6 months, 2 weeks ago

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Here is my problem on displacement, velocity and acceleration topic - Desing of the car is a wow. Sandeep Bhardwaj · 6 months, 2 weeks ago

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Another problem on displacement, velocity, acceleration can u average (sine)ing function? Sparsh Sarode · 6 months, 2 weeks ago

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My new one for Function-Graphs: Double Crosses Worranat Pakornrat · 6 months, 2 weeks ago

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My entry for complex numbers and binomial theorem (I still solve some): Ouch... 敬全 钟 · 6 months, 3 weeks ago

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(sine)ing a problem on displacement, acceleration, velocity Sparsh Sarode · 6 months, 3 weeks ago

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My question on floors and ceilings.

Don't Get Confused! Lee Care Gene · 6 months, 3 weeks ago

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My submission for decimals. : Working out with decimals! Miraj Shah · 6 months, 3 weeks ago

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A graph problem Prince Loomba · 6 months, 3 weeks ago

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My submission is "TEDIOUS I"

https://brilliant.org/problems/tedious-i/ Aakash Khandelwal · 6 months, 3 weeks ago

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My contribution to floor and ceiling functions: A road with holes Rohit Ner · 6 months, 3 weeks ago

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displacement when v=0 problem on displacement and velocity Sparsh Sarode · 6 months, 3 weeks ago

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1 2. 2 problems on distances, velocity, acceleration.. Sparsh Sarode · 6 months, 3 weeks ago

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THIS is a fresh ceiling problem ;D Margaret Zheng · 6 months, 3 weeks ago

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@Margaret Zheng Nice problem, Margaret! Thanks!

Waiting for more from your side. ;) Sandeep Bhardwaj · 6 months, 3 weeks ago

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@Sandeep Bhardwaj Thanks and I will keep working:) My exams are coming up next week so I am trying my best. Margaret Zheng · 6 months, 3 weeks ago

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My problem for combinatorics expected value: A surprising invention. My problem for combinatorics recurrence relations:The Chase of Doom Www Www · 6 months, 3 weeks ago

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@Www Www Nice problem! @Www Www

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 · 6 months, 3 weeks ago

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Here is my question for logic Prince Loomba · 6 months, 3 weeks ago

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@Prince Loomba Great! Thanks Prince for an awesome problem.

Waiting to see more of your awesome problems. :) Sandeep Bhardwaj · 6 months, 3 weeks ago

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Here's my new one for Combinatorics-Distribution into Identical Bins: The pawn can't stand alone. Worranat Pakornrat · 6 months, 3 weeks ago

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@Worranat Pakornrat A great one as usual. ;)

Thanks Dr. Warm! Waiting for more. :P Sandeep Bhardwaj · 6 months, 3 weeks ago

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@Sandeep Bhardwaj Thanks! Looking forward to it, too. 😉 Worranat Pakornrat · 6 months, 3 weeks ago

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

Basics in Area : https://brilliant.org/problems/just-two-lines/ Akash Shukla · 6 months, 3 weeks 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 · 6 months, 3 weeks ago

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@Soumava Pal @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 · 6 months, 3 weeks ago

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@Soumava Pal You have interchanged the brackets! Prince Loomba · 6 months, 3 weeks ago

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@Prince Loomba Yea sorry, I forgot all my LateX in all this pressure with the exams. :p Soumava Pal · 6 months, 3 weeks ago

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My entry is for complex numbers: A Problem in Complex Numbers! Miraj Shah · 6 months, 3 weeks ago

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@Miraj Shah The problem is good. But it is not from the 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 · 6 months, 3 weeks ago

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My submission for curve sketching : Desmos is for donkeys Rohit Ner · 6 months, 4 weeks ago

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@Rohit Ner Wonderful problem! I loved this problem very much. Thanks for sharing this!

Waiting for more problems. @Rohit Ner Sandeep Bhardwaj · 6 months, 3 weeks ago

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My entries will be listed here.

Hobart Pao · 6 months, 4 weeks ago

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@Hobart Pao Nice problem! I hope you to increase the number of entries listed here. ;) Sandeep Bhardwaj · 6 months, 3 weeks ago

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@Sandeep Bhardwaj Thanks. I'll try but still have many exams coming up. Hobart Pao · 6 months, 3 weeks ago

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Count me in with this classic piece of calculus-1920 Calculus Horror Anshuman Bais · 6 months, 4 weeks ago

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@Anshuman Bais Hi Anshuman. Nice problem! You can make your comment formatted more nicely by the following:

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

Thanks! Hobart Pao · 6 months, 3 weeks ago

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@Hobart Pao Done Thanks Anshuman Bais · 6 months, 3 weeks ago

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My entry for Velocity and Acceleration Joao Miguel Coelho · 6 months, 4 weeks ago

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Here are two submissions for logic: 1) A Murder Mystery Game 2) Alien Abduction Problem Kunal Verma · 6 months, 4 weeks ago

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Who can swim? Vee Zhi · 6 months, 4 weeks ago

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My first problem here.

Decimals Warmup Lee Care Gene · 6 months, 4 weeks ago

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a problem about decimals Margaret Zheng · 6 months, 4 weeks ago

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Here is a question on recursion Prince Loomba · 6 months, 4 weeks ago

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This is my new one for Combinatorics-Recurrence Incursion: Wire Hive. Worranat Pakornrat · 6 months, 4 weeks ago

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My entries for Logic 1 Logic 2 Logic 3 Geoff Pilling · 6 months, 4 weeks ago

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So, should we write new problems for these pages, or use ones we've already published? Geoff Pilling · 6 months, 4 weeks ago

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2 questions for the topic: Function graphs.

Here and here Hung Woei Neoh · 6 months, 4 weeks 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 · 7 months ago

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Here is my contribution for the acceleration one. Tanishq Varshney · 7 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 · 7 months ago

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My submissions Math Archive (13)

Math Archive (14) Shivam Jadhav · 7 months ago

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For logical reasoning topic, we need problems mainly on Truth Seeking subtopic. Thanks! Sandeep Bhardwaj · 7 months ago

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@Sandeep Bhardwaj This easy problem on floor from my side sir Gauri shankar Mishra · 7 months ago

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@Gauri shankar Mishra To my surprise u have reposted this question sir !!!!!!!! Gauri shankar Mishra · 6 months, 4 weeks ago

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@Sandeep Bhardwaj @Sandeep Bhardwaj Sir . This is my submission for Truth Seeking subtopic. A total of 6 problems. Abhay Tiwari · 6 months, 4 weeks ago

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A hard logic puzzle Prince Loomba · 6 months, 3 weeks 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 · 6 months, 4 weeks ago

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