factorial quiz!

Number Theory Level 1

3! = 6

2! = 2

1! = 1

0! = 1

(-1)! = ?

What is (-1) factorial?

-1 Undefined 0 1

Jake Maason by Jake Maason , 28, USA

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1 solution

Vaibhav Kandwal
Dec 29, 2014

Well, n! is for integer n < 0 not defined -- as yet.

0 Helpful 0 Interesting 0 Brilliant 0 Confused

Why not?

(it wants me to post more than that, but I really don't want to. So please ignore the rest of this.)

Jake Maason - 6 years, 5 months ago

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It's just like dividing by zero, which is also not possible, I'll do some research on it and then let you know.. :D Cheers

Vaibhav Kandwal - 6 years, 5 months ago

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What did you find out?

Jake Maason - 5 years, 6 months ago

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@Jake Maason – Sorry Dude, Nothing is available online

Vaibhav Kandwal - 5 years, 6 months ago

Well, actually the answer can be obtained from the gamma function, wherein we get gamma of zero to be tending to infinity, thus undefined. But as a matter of fact, factorial definition is not restricted to natural numbers.

Ghanashyam Chakravarthi - 6 years, 3 months ago

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