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The "aha!" problems - 6 fascinating factorial


Best Answer Rainman, 01 May 2014 - 12:29 PM

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#1 bonanova

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Posted 01 May 2014 - 12:08 PM

We denote by factorial n! the product of the first n integers.

23! = 2585201ab38884976640000.

Without performing multiplications, find the digits denoted here by a and b.


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#2 Rainman

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Posted 01 May 2014 - 12:29 PM   Best Answer

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