Double Factorial
Five factorial or 5! = 5 x 4 x 3 x 2 x 1 = 120. Five Double factorial means the product of all positive integers less than or equal to five with the same parity (odd or even) as the integer 5. For example, 5!! = 5*3*1 = 15. Based on this information, find 15!!
Problem submitted by Pat Costello, Eastern Kentucky University
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