Why factorial of zero is equals to one not zero - 0! = 1 ?

Factorial is a mathematical operator. If we take factorial of 5 then its equal to 5x4x3x2x1. Factorial is represented by ! or ㄴ. If n is the number then factorial of n can be represented by n! or ।n. For example: 2! = 2x1 3! = 3x2x1 4! = 4x3x2x1 5! = 5x4x3x2x1 n! = nx(n-1)x(n-2)x(n-3)x............. From above now we have a basic idea about factorial. We have a got a chapter called Permutation and Combination in class 10, 11 and 12 mathematics or advance mathematics. From that chapter we know nPr= 1 / 2

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