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Grade: 12th pass

                        

why 0! is one. and what the actual defination of factorial how it can be justified that 1! is also one.

why 0! is one. and what the actual defination of factorial how it can be justified that 1! is also one.

4 years ago

Answers : (1)

Vijay Mukati
askIITians Faculty
2590 Points
							Since, n! = n (n-1)!, so from here for n = 1, 1! = 1 * 0! and thus 0! = 1.

Thanks, Vj
4 years ago
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