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Math Calculators
Factorial Calculator
Calculate n! — the product of all positive integers up to n.
n!
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About the Factorial Calculator
The factorial of a non-negative integer n (written n!) is the product of all positive integers from 1 up to n. By definition, 0! = 1.
Formula: n! = n × (n−1) × (n−2) × ... × 1
Factorials are used in combinatorics, probability, and permutation/combination calculations.
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