That is related with the fact that 1 is the identity element (or neutral element) of multiplication - and factorials are defined as multiplications.
Defining 0 factorial thus simplifies several formulae.
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Factorial(0), or 0! = 1.
factorial of -1
a factorial number is a number multiplied by all the positive integers i.e. 4!=1x2x3x4=24 pi!=0.14x1.14x2.14x3.14 0!=1
The simplest answer is - because it is only defined for n = 0 (0! = 1) and n > 0 (n! = (n-1)! x n).
Yes. 0! = 1 But otherwise, no.