Factorial. n! = 1x2x3x4x.....x(n-2)x(n-1)xn.
Examples:
3! = 1x2x3 = 6
7! = 1x2x3x4x5x6x7=5040
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An exclamation mark after a number is the symbol for the factorial function.
It can have the regular meaning of an exclamation point - that you want to draw the attention to the number. However, in math it may also refer to the factorial of the number. It means that you multiply all positive integers up to that number together. For example:5! = 1 x 2 x 3 x 4 x 5 = 120.
The exclamation point is called a factorial. ex. 5!=5x4x3x2x1 10!=10x9x8x7x6x5x4x3x2x1 etc.
an exclamation point !
An exclamation mark stands for factorial. For instance, if the number is 7!, then that would be 7x6x5x4x3x2x1. =================================================== Factorial means you multiply the integer written by every integer below it until you reach 1. Oddly enough, 0! = 1. There is also a 'factorial' function for non-integral values, called the Gamma function.