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What-is-the-double-factorial-function-i-e-x-




Question Number 2931 by Filup last updated on 30/Nov/15
What is the double factorial function?  i.e.     x!!
Whatisthedoublefactorialfunction?i.e.x!!
Answered by 123456 last updated on 30/Nov/15
x!!=x(x−2)!!,x∈N  0!!=1  1!!=1  6!!=6×4×2×0!!=6×4×2=48  5!!=5×3×1=15
x!!=x(x2)!!,xN0!!=11!!=16!!=6×4×2×0!!=6×4×2=485!!=5×3×1=15

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