Request For Solutions Messageboard

I'd be using this post to help organize good problems which are lacking worthy solutions.

If you would like to see a solution to a particular problem, please state the problem title, provide a link to it and also state the topic. You can also @mention the creator, so that she/he is made aware. If the problem was already listed, you can upvote the comment. To keep this list reasonable, these problems should have been posted for at least a week.

If you added a solution to the problem, please reply to the comment. Once your solution has been upvoted several times, I'd then clear out the comment, so as to keep things fresh. (Do not post your solution as a reply)

Once someone has added a solution, I will push the comment to the top. Please can check their solution, and provide some feedback on it. If you have a different approach, add it and enlighten all of us.

Kudos to the following for writing solutions.
1. Jatin Yadav $\times 3$
2. Siddhartha Srivastava
3. Kumar Gupta
4. Jon Haussman
5. Beakal Tiliksew
6. [Happy melodies}(https://brilliant.org/profile/happy-a75fqm/feed/)
7. Pranav Arora $\times 2$
8. Nathan Ding
9. N K
10. Ariel Gershorn

Solutions which need reviewing
1. Another Infinite Circuit
2. Colourful Electrons
3. Domino domination

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print "hello world"

Math

Appears as

Remember to wrap math in $ ... $ or \[ ... \] to ensure proper formatting.

2 \times 3

2 \times 3

2^{34}

2^{34}

a_{i-1}

a_{i-1}

\frac{2}{3}

\frac{2}{3}

\sqrt{2}

\sqrt{2}

\sum_{i=1}^3

\sum_{i=1}^3

\sin \theta

\sin \theta

\boxed{123}

\boxed{123}

Easy Math Editor

This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of math and science.

When posting on Brilliant:

Use the emojis to react to an explanation, whether you're congratulating a job well done , or just really confused .
Ask specific questions about the challenge or the steps in somebody's explanation. Well-posed questions can add a lot to the discussion, but posting "I don't understand!" doesn't help anyone.
Try to contribute something new to the discussion, whether it is an extension, generalization or other idea related to the challenge.
Stay on topic — we're all here to learn more about math and science, not to hear about your favorite get-rich-quick scheme or current world events.

Markdown	Appears as
`italics` or `_italics_`	italics
`bold` or `__bold__`	bold
- bulleted - list	bulleted list
1. numbered 2. list	numbered list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1 paragraph 2	paragraph 1 paragraph 2
`[example link](https://brilliant.org)`	example link
`> This is a quote`	This is a quote
# I indented these lines # 4 spaces, and now they show # up as a code block. print "hello world"	# I indented these lines # 4 spaces, and now they show # up as a code block. print "hello world"

Math	Appears as
Remember to wrap math in `$` ... `$` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$

Comments

Another Infinite Circuit, Electricity and Magnetism

@Vishnuram Leonardodavinci and @Jon Haussmann , can you please add a solution to this problem?

I understand it sounds strange because I am myself in the recent solvers list. My approach to this problem is flawed (which I later realised). I will explain it in comments once the solution is posted.

Pranav Arora - 7 years, 1 month ago

@Calvin Lin : Jon Haussmann has added a solution to the problem, can you please add him to the list? :)

Thanks!

@Sharky Kesa I would like a solution to A trigonometric integral , Calculus

jatin yadav - 7 years, 2 months ago

@Sharky Kesa : Can you please post a solution to this? :)

@Jon Haussmann @Cole Coupland Can you please post a solution?

Thanks.

jatin yadav - 7 years, 1 month ago

@Sharky Kesa Can you add a solution? Thanks.

Calvin Lin Staff - 7 years ago

One for CS Twenty million chances to get it wrong

Thaddeus Abiy - 7 years, 2 months ago

Ah yes. I remember this problem. I'd love a solution to this

Kp Govind - 7 years, 2 months ago

@Chung Gene Keun Can you add a solution to this problem?

Calvin Lin Staff - 7 years, 1 month ago

The Answer Is Not 0.225, Algebra

Calvin Lin Staff - 7 years, 2 months ago

@Sami Cool @Ritwik Mohanty @Nilotpal Chakraborty @Irvi Firqotul Aini @Kevin J. @Sameer Wadjikar

Care to share how you solved this problem?

@Milun Moghe I would like a solution to We Often See It Like This Electricity And Magnetism

@Vishnuram Leonardodavinci Care to share how you solved this problem?

Can @Anish Puthuraya please add a solution to the problem The Journey of the Solitary Rod? https://brilliant.org/community-problem/the-journey-of-the-solitary-rod/?group=aEbPpxv9oKGo&ref_id=186844

A Former Brilliant Member - 7 years, 1 month ago

@2000 as Powers of 2..............please provide a solution to this ....@Calvin Lin @Daniel Liu @jatin yadav @Vishnuram Leonardodavinci @Jon Haussmann

Ujjwal Mani Tripathi - 7 years, 1 month ago

I would like a hint or a solution to the problem Domino Domination..

My approach was to come up with a recursive definition of the process and then find the solution using a computer program but I couldn't do it.....Should the problem be approached in any other way??

Eddie The Head - 7 years, 1 month ago

Solve the recurrence relation, and you should be able to obtain an explicit formula. Check OEIS if necessary.

What is OEIS??

@Eddie The Head – Online Encyclopedia of Integer Sequences.

Siddhartha Srivastava - 7 years, 1 month ago

Sir can you help me with this problem??Especially the case where it is generalized(nxn determinant)??

ascending and descending please provide a solution to this problem @Calvin Lin @Jon Haussmann @Daniel Liu @Vishnuram Leonardodavinci @jatin yadav @Eddie The Head

Ujjwal Mani Tripathi - 7 years ago

Its just a note. But could someone please post a suggestion on how to go about with it Buried Treasure

Vishwa Shah - 7 years ago

How to solve this??? 2014 towns? 1402 roads? @Hoo Zhi Yee

Happy Melodies - 7 years ago

https://brilliant.org/community-problem/its-youngs-excluded-not-olds-included/?group=lyFLsSKNBAIu @Milun Moghe @Vishnuram Leonardodavinci @Anish Puthuraya
Can you please add a solution to it?

A Former Brilliant Member - 6 years, 11 months ago

@Jon Haussmann @calvin lin @ Vishnuram leonardodavinci Ap or not ap part 2 .....Please provide a solution to this problem

Ujjwal Mani Tripathi - 6 years, 9 months ago

This problem

U Z - 6 years, 5 months ago

Having a doubt in this problem can you please check @Calvin Lin

@Jon Haussmann sir please provide a solution to Not as easy as it looks

Ujjwal Mani Tripathi - 6 years, 3 months ago

I have posted a solution.

Jon Haussmann - 6 years, 3 months ago

Thanks a lot again

I would like a solution to this Electricity and Magnetism problem: Gauss Practice (Hard)

Kp Govind - 6 years, 2 months ago

Am I expected to tag people here?

Yes then they'll come to see your post

Ujjwal Mani Tripathi - 6 years, 2 months ago

@Ujjwal Mani Tripathi – Ok. @David Mattingly: Sir can you please post a solution to the problem?

@Jon Haussmann sir please provide a solution for ... Inspired by mehul chaturvedi

Ujjwal Mani Tripathi - 5 years, 1 month ago

Can you post the link to the problem?

Jon Haussmann - 5 years, 1 month ago

I'm guessing he means this problem. However, there are already several distinct solutions posted.

Calvin Lin Staff - 5 years, 1 month ago

@Brian Charlesworth @Jon Haussmann sir please provide a solution to That is close

Ujjwal Mani Tripathi - 4 years, 11 months ago

Like I said before, you need to provide a link to the problem.

Jon Haussmann - 4 years, 11 months ago

i have posted the link https://brilliant.org/problems/that-is-close/?ref_id=1232530

@Jon Haussmann sir can you provide solution to this

Ujjwal Mani Tripathi - 4 years, 4 months ago

@Michael Huang can u please provide a solution to your problem Sum tower of hanoi

space sizzlers - 2 years, 10 months ago

Ah, but the problem is very difficult that no one has proven the answer yet. It's interesting though!

Michael Huang - 2 years, 10 months ago

@Michael Huang where did you get this question from??Maybe we can search for the source to find a solution finally !!!

space sizzlers - 2 years, 9 months ago

@Space Sizzlers – I was inspired by the Tower of Hanoi problem when I was playing around with coding and some puzzles. This problem is original. :)

Michael Huang - 2 years, 9 months ago

@Michael Huang – @Michael Huang so how did you come up with the answer ?? p.s Great to know that it is original problem :)

@Space Sizzlers – It's from making logical deductions of how the disks can be shifted. But that seems to be more of brute force other than logical reasoning.

@Michael Huang – Thanks man...still working on he solution though ;)

Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$