# Computing Factorials

In this lesson, we will use recursion to solve the basic mathematical problem of computing a factorial.

## What is a factorial?

A factorial is the product of an integer and all the positive integers less than it. It is denoted by the symbol: $!$

For example, 4! (read as four factorial) is denoted as follows:

$4!=4\times3\times2\times1=24$

$6!=6\times5\times4\times3\times2\times1=720$

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