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Factorials are used in combinatorial mathematics, which is a fancy term for a branch of mathematics that's used to answer questions like "how many different ways are there to arrange N items?" (Answer: N!) It turns out that using the formulas developed by combinatorial mathematics, the term 0! occasionally turns up, and in order to obtain the correct answer it's necessary to replace 0! with 1. Most obviously, there's no other way to arrange a "set" of zero items than to have ... um ... zero items, so the number of ways zero items can be arranged is 1, therefore 0! = 1.
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What is factorial of 0?
Factorial(0), or 0! = 1.
Why 0 factorial is assumed to be 1?
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.
What is factorial of 998?
factorial of -1
What is the factorial of any number?
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
Why factorial is not possible in negative?
The simplest answer is - because it is only defined for n = 0 (0! = 1) and n > 0 (n! = (n-1)! x n).
