1. factorialMathematics
Wikipedia definition
2. FactorialThe first few and selected larger members of the sequence of factorials. The values specified in scientific notation are rounded to the displayed precision. In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, The value of 0! is 1, according to the convention for an empty product.
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