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# Factorial

Results
Tool for computing factorials. Factorial n! is the product of all integers numbers (not zero) inferior or equal to n, it is symbolized by an exclamation point juxtaposed after the number.
Summary

## Gamma Calculator Γ(N)

### How to calculate a factorial?

Factorial of a number $n$ is calculated with a multiplication: it is the product of the positive integers numbers (not null) less or equal to $n$.

The usual notation to indicate a factorial is the exclamation mark positioned after the number. The factorial of $n$ is noted $n!$.

$$n!=\prod_{k=1}^n k$$

Example: $$4! = 1 \times 2 \times 3 \times 4 = 24$$

## Source code

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