Double factorial / product of odds and relation ( (2n+1)! = 1\cdot3\cdot5\cdots(2n+1)\cdot 2^n n! ).
Accedmychevron_right11thchevron_rightmathchevron_rightPermutations And Combinationschevron_rightExercise 7.1
Double factorial / product of odds and relation ( (2n+1)! = 1\cdot3\cdot5\cdots(2n+1)\cdot 2^n n! ).