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A double factorial denoted n!!, and sometimes called an odd factorial, issimilarto a factorial, but only includes digits of the same parity (odd/even).
For example:
5! = 1 x 2 x 3 x 4 x 5 = 120
5!! = 1 x 3 x 5 = 15
(the product of all odd positive integers up to and including 5)
6! = 1 x 2 x 3 x 4 x 5 x 6 = 720
6!! = 2 x 4 x 6 = 48
(the product of all even positive integers up to and including 6)
This operation is mainly used in higher level integrals.
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