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Product of all integers between 1 and the integral input of the function
In mathematics, the factorial of a non-negative integer n {\displaystyle n}, denoted by n ! {\displaystyle n!}, is the product of all positive integers less than or equal to n {\displaystyle n}. The factorial of n {\displaystyle n} also equals the product of n {\displaystyle n} with the next smaller factorial: n ! = n × ( n − 1 ) × ( n − 2 ) × ( n − 3 ) × ⋯ × 3 × 2 × 1 = n × ( n − 1 ) ! {\displays... Wikipedia