# Hardest Problems on Brilliant

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.

Note by Finn Hulse
7 years, 6 months ago

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Hi 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.

Staff - 7 years, 6 months ago

This probl em is truly mesmerizing.

- 7 years, 6 months ago

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.

- 7 years, 6 months ago

Thanks!

- 7 years, 6 months ago

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

- 7 years, 6 months ago

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

- 7 years, 6 months ago

Yeah, Ryan sums it up pretty well right here.

Staff - 7 years, 6 months ago

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

- 7 years, 6 months ago

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

- 7 years, 6 months ago

Cool.

- 7 years, 6 months ago

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

- 3 years, 9 months ago

- 1 year, 2 months ago

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.

Staff - 7 years, 6 months ago

Wow a problem with over 3000 rating O.o

- 7 years, 6 months ago

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

- 7 years, 6 months ago

Holy moly. \Tries to solve

- 7 years, 6 months ago

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

- 7 years, 6 months ago

Personally thought this algebra problem was particularly difficult :P

- 7 years, 6 months ago

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

- 7 years, 6 months ago

There you go , my friend!! :D

- 7 years, 6 months ago

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

- 3 years, 8 months ago

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

- 7 years, 6 months ago

Hi Jose,

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

Staff - 7 years, 6 months ago

(-1)^π

Hardest problem...

- 6 years, 2 months ago

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...

- 7 years, 6 months ago

Knock yourself out:

You won't do it.

Noone's done it.

- 6 years, 11 months ago