# What is 10! - Factorial for integer 10?

## Definition & Formula

**Factorial** is a basic mathematic function often represented by **n!** in mathematics, represents the product of all integers less than or equal to the positive integer n. An important function frequently used in combinatorics (*permutations* & *combinations*) theory.

For example, 10! can be written as

10! = 1 x 2 x 3 x . . . . x 9 x 10

10! = 3628800

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