Does anyone have a difficult math riddle?

Answer 1

Best Answer - Chosen by Asker

This website is loaded with tons of Math Riddles and other fun math stuff.

http://home.att.net/~numericana/answer/r…

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Asker's Comment:

Yeah cool!

Answer 2

If you want really tough, try one of the Millennium Problems from www.claymath.org. Not only are the hard, but to solve one earns you a million dollars and a nobel prize.