👉 A factorial, denoted by n!, is a function that computes the product of all positive integers up to and including n. For example, 5! = 5
4
3
2
1 = 120.
Factorial functions are important in mathematics as they allow us to calculate the total number of ways to arrange or distribute a set of items into groups. They are also used in various fields such as computer science, finance, and statistical analysis.