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Calculate factorials (n!).
Calculate factorials (n!) for any non-negative integer up to 170.
The factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n.
Formula: n! = n × (n-1) × (n-2) × ... × 2 × 1
Special case: 0! = 1 (by definition)