Factorial
n! = n . (n - 1) . (n - 2) . ...... . 2 . 1
WHAT IS IT ?
The factorial of a positive integer n, denoted by n!, is the product of all positive integers less than or equal to n. actorials are used in various areas of mathematics, including combinatorics, algebra, and calculus, to calculate permutations, combinations, and in the expansion of series.
CALCULATION:
EXAMPLE:
5! = 5 . 4 . 3 . 2 . 1 = 120
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