The “odd/even factorial” of a positive integer n is represented as n!! and is defined  recursively as:  a. (n)*(n-2)*(n-4)………*(2) if n is even. For example, 6!! = 6*4*2 = 48  b. (n)*(n-2)*(n-4)*…….*(5)*(3)*(1) if n is odd. For example, 7!! = 7*5*3*1 = 105.  Come up with a recursive definition for n!! and use it to guide you to write a method definition  for a method called “oddevenfact” that recursively calculates the odd/even factorial value of its  single int parameter. The value returned by “oddevenfact” is a long.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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The “odd/even factorial” of a positive integer n is represented as n!! and is defined 
recursively as: 
a. (n)*(n-2)*(n-4)………*(2) if n is even. For example, 6!! = 6*4*2 = 48 
b. (n)*(n-2)*(n-4)*…….*(5)*(3)*(1) if n is odd. For example, 7!! = 7*5*3*1 = 105. 
Come up with a recursive definition for n!! and use it to guide you to write a method definition 
for a method called “oddevenfact” that recursively calculates the odd/even factorial value of its 
single int parameter. The value returned by “oddevenfact” is a long. 

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