How is the exclamation mark used in math?

Answer 1

In mathematics, the exclamation mark is often used to represent the factorial of a number. The factorial of a non-negative integer n, denoted as n!, is the product of all positive integers up to n. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120. The exclamation mark is also used in some mathematical notations to indicate a specific operation or property, such as the subfactorial function.

Answer 2

An exclamation point after a number is the factorial function; meaning you should multiply all numbers up to the specified number.

Example: 4! = 1 x 2 x 3 x 4 = 24.

0! is defined as 1.