Factorials

The factorial of a number is the product of all the whole numbers, except zero, that are less than or equal to that number.

1!	1 = 1
2!	2 × 1 = 2
3!	3 × 2 × 1 = 6
4!	4 × 3 × 2 × 1 = 24
5!	5 × 4 × 3 × 2 × 1 = 120
6!	6 × 5 × 4 × 3 × 2 × 1 = 720
7!	7 × 6 × 5 × 4 × 3 × 2 × 1 = 5,040
8!	8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 40,320
9!	9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 362,880
10!	10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 3,628,800
11!	11 × 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 39,916,800
12!	12 × 11 × 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 479,001,600

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