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# The "aha!" problems - 6 fascinating factorial

Started by bonanova, May 01 2014 12:08 PM

1 reply to this topic

### #1

Posted 01 May 2014 - 12:08 PM

We denote by factorial * n*! the product of the first

*integers.*

**n**23! = 2585201

**38884976640000.**

*ab*Without performing multiplications, find the digits denoted here by

*and*

**a***.*

**b***The greatest challenge to any thinker is stating the problem in a way that will allow a solution.*

- Bertrand Russell

### #2

Posted 01 May 2014 - 12:29 PM Best Answer

Spoiler for

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