Web Reference: Aug 1, 2025 · Find the number of ways of getting an ordered subset of r elements from a set of n elements as nPr (or nPk). Permutations calculator and permutations formula. Free online permutations calculator. More generally: choosing r of something that has n different types, the permutations are: (In other words, there are n possibilities for the first choice, THEN there are n possibilites for the second choice, and so on, multplying each time.) Which is easier to write down using an exponent of r: This free calculator can compute the number of possible permutations and combinations when selecting r elements from a set of n elements.
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