Factorial Notation


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Let n be a positive integer. The continued product of first n natural numbers is called factorial n and is denoted as n!.

Note:

1. O!= 1

2. When n is a negative or fraction, n! is not defined.

Examples:

8! = 8 x 7 x 6 x 5 x4 x 3 x 2 x 1 = 40320



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