Example Of Factorial Function

Example Of Factorial Function:    n! = 1.2.3...............(n-2)(n-1)n

0! = 1             1! = 1         2! = 1.2 = 2              3! = 1.2.3 = 6
 4! = 1.2.3.4 = 24  5! = 1.2.3.4.5 = 120  6! = 1.2.3.4.5.6 = 720
and so observe that 
             5! = 5.4! = 5.24 = 120

This is true for every positive integer n;  that is,
      n! = n.(n.1)!

(Factorial Function)

(a)  If n = 0, then n! = 1.
(b)  If n > 0, then n! = n. (n-1)! 

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