Double Factorial

Number Theory Level 3

What is the value of- ( − 1 ) ! ! (-1)!!

1 0 Not Defined Infinite

Aashish Patel by Aashish Patel , 20, India

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1 solution

Aashish Patel
Apr 8, 2015

-1!!=0!!=1

It is a definition by George B Arfken.

2 Helpful 0 Interesting 0 Brilliant 0 Confused

You should make it clear if you are asking for

( ( − 1 ) ! ) ! ((-1)! )! or − ( 1 ! ) ! - (1!)! or ( − 1 ) ( ! ! ) (-1) (!!) or etc...

Calvin Lin Staff - 6 years, 2 months ago

The gamma functions extended up to complex numbers...and negative integers

Krishna Shankar - 6 years, 1 month ago

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