Source: wikibot/factorial-code
= Factorial code
{wiki=Factorial_code}
A factorial is a mathematical operation typically denoted by an exclamation mark (!), which multiplies a given positive integer by all positive integers below it down to 1. For example, the factorial of 5 (written as 5!) is calculated as: \\\[ 5! = 5 \\times 4 \\times 3 \\times 2 \\times 1 = 120 \\\] Factorial code usually refers to programming implementations that calculate the factorial of a number.