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Number of ordered arrangements of r items from n, nPr = n!/(n-r)!. Requires r ≤ n and r ≤ 10000.
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https://combinatorics.openverbs.com/v1/permutations
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combinatoricsfactorialpermutationscombinationsbinomialpermutations nprcompute permutationsordered arrangementsnpr apipermutation count
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