# What is 15! - Factorial for integer 15?

## 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, 15! can be written as

15! = 1 x 2 x 3 x . . . . x 14 x 15

15! = 1307674368000

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