MathBin	Factorial	Member

The Factorial of a positive integer n, denoted by n!, is the product of all positive integers less than or equal to n: n! = n × (n - 1) × (n - 2) × ... × 3 × 2 × 1. For example, 5! = 5 × 4 × 3 × 2 × 1 = 120. The value of 0! is 1. This bin uses BigInt to calculate the factorial for n.