Could you guys post links to the hardest problem you have ever encountered on Brilliant? That way users who are hunting for difficult problems can solve them and boost their rating. Please do not post answers.

There was a number theory before the site was revamped, one that dealt with remainders modulus 19 and included three variables (unknowns, k,a,b based on certain restrictions though). The only answer I saw for that question had an incomplete proof, so that should be sufficient evidence for its difficulty. If anybody here is able to find it...

Easy Math Editor

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or`_italics_`

italics`**bold**`

or`__bold__`

boldNote: you must add a full line of space before and after lists for them to show up correctlyparagraph 1

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Remember to wrap math in \( ... \) or \[ ... \] to ensure proper formatting.`2 \times 3`

`2^{34}`

`a_{i-1}`

`\frac{2}{3}`

`\sqrt{2}`

`\sum_{i=1}^3`

`\sin \theta`

`\boxed{123}`

## Comments

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TopNewestHi Finn,

I thought this problem was breathtakingly beautiful in it's simplicity.

I'll ask around the office and see if we can dig up a historically absurdly difficult problem for you to look at.

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This is really a nice problem.I couldn't take up the courage 2 write d correct answer as i was nt sure 4 it.

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This probl em is truly mesmerizing.

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Hi,this problem is deleted so could anyone tell me what was it?

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Try this one out: https://brilliant.org/community-problem/an-interesting-problem-264/?group=iiMQMGYWAfX2

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Cool.

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This....is.....HILARIOUS!!! :D

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I Love this problem, took me so long to get the courage to type in the answer

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Yeah, Ryan sums it up pretty well right here.

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Yeah that one was crazy hard... I mean seriously! That took me forever! ;)

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Thanks!

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We are pretty sure this is the hardest algebra problem on Brilliant. Could be wrong though, ratings are a dynamic thing.

Edit: I bungled the link the first time it should work now.

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Wow a problem with over 3000 rating O.o

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That's right, I kneel down when I see this problem...

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Holy moly. \Tries to solve

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Personally thought this algebra problem was particularly difficult :P

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Can someone post the hardest Combinatorics problem they've come across?

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Hi Jose,

I don't think this is the hardest combinatorics problem on Brilliant, but this one is relatively recent and rated quite high.

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Maybe hard. https://brilliant.org/community-problem/strokes/?group=HdtDpoEPM9Zd&ref_id=88876

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(-1)^π

Hardest problem...

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Knock yourself out:

You won't do it.

Noone's done it.

You might do it.

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There was a number theory before the site was revamped, one that dealt with remainders modulus 19 and included three variables (unknowns, k,a,b based on certain restrictions though). The only answer I saw for that question had an incomplete proof, so that should be sufficient evidence for its difficulty. If anybody here is able to find it...

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Also, just for fun, you can post a ridiculously easy problem.

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ridiculuously easy..... x^2 >= xy >= y^2 show that 9(x^2)+6(xy)+(y^2) >= 0

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There you go , my friend!! :D

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