03 February 2006

!


Factorial: mathmatical operation, n! calculates the product of 1 to n.

0! = 1 (by definition)
1! = 1
2! = 2x1 = 2
3! = 3x2x1 = 6
4! = 4x3x2x1 = 24
5! = 5x4x3x2x1 = 120
(...)

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