What is the formula for the number of permutations of n objects taken r at a time?, What is the formula for the number of permutations of n objects taken all at a time? - P (n, n) = n!, What is an arrangement of a set of objects where order does matter?  - Permutation, What is an arrangement of a set of objects where order does not matter? - Combination, What is the formula of permutation where some objects are alike?, What is the formula for the number of permutations of n objects in a circular arrangement? - P = (n – 1)!, What is the formula for the number of combinations of n objects taken r at a time?,

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