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This tag is for challenges involving the factorial of a number, the product of the numbers from 1 to n

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Mathematics is fact. Programming is not

often means factorial and it comes after the argument. In programming an exclamation mark ! often means negation and it comes before the argument. … Factorial has higher precedence than negation so factorials are always applied first. For example, !!!0!!!! truly means !!!(0!!!!), or better yet !(!(!((((0!)!)!)!))). …
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