How come factorial of zero is equal to one

[From: ] [author: ] [Date: 11-10-24] [Hit: ]

= 1 (1-1)!or, 1 = 0!So factorial of Zero is one.-n! = n x (n-1)!......

n! = n(n-1)(n-2)...3.2.1
or, n! = n(n-1)!

If n=1 then

1! = 1 (1-1)!
or, 1 = 0!

So factorial of Zero is one.

n! = n x (n-1)!
1!= 1*0!
1=0!

it is a useful definition !

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