1 factorial = 1
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Zero factorial = 1
0!=1! 1=1 The factorial of 0 is 1, not 0
Zero factorial, written as 0!, equals 1. This is a simple math equation.
A recursive formula for the factorial is n! = n(n - 1)!. Rearranging gives (n - 1)! = n!/n, Substituting 'n - 1' as 0 -- i.e. n = 1 -- then 0! = 1!/1, which is 1/1 = 1.
The value of 9 factorial plus 6 factorial is 363,600