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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.

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what year was the exclamation mark invented in