A factorial is a whole number multiplied by all the whole numbers less than that number. So 3 factorial (written as 3!) is 3 times 2 times 1=6
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3! = 6
Do you mean an exclaimation mark (!) An exclamination mark means factorial so............. 3! = 3 factorial 3 factorial means 1x2x3 = 6 2! or 2 factorial means 1x2 = 2 4! or 4 factorial means 1x2x3x4 = 24
5 factorial = 5*4*3*2*1 = 120
2*3*4 - 1 = 23 and 2*3*4 + 1 = 25 and not a factorial in sight! Oops.. sight.
factorial of -1