Problem 45189. Double Factorial

Return double factorial

        n(n-2)...(5)(3)(1),   n>0, odd
n!!  =  n(n-2)...(6)(4)(2),   n>0, even
        1                 ,   n = -1, or n = 0

For example

6!! = (6)(4)(2) = 48

Solve

Solution Stats

46.15% Correct | 53.85% Incorrect
Last Solution submitted on Sep 18, 2024

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