n!/(n-r)!, n> r - The number of permutations taken at a time where n>r, n! - The number of permutations of n objects taken n at a time, n!/(n1! x n2! x n3! x…x nk!) - The number of distinguishable permutations of n objects when p are alike, q are alike, and so on., (n-1)! - The number of permutations of n objects around a circle, n!/r!(n-r)! , where n>r - The number of combinations taken r at a time ,

permutation-remember-match up

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