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4 results for “permutations”

Formulae (4)

P(n,r) = \frac{n!}{(n-r)!}

Number of ordered arrangements of r items from n.

P(n,r) = \frac{n!}{(n-r)!}

Number of ordered arrangements of r items from n.

n^r

Ordered arrangements of r items from n when repetition is allowed.

\frac{n!}{n_1! n_2! \cdots n_k!}

Arrangements of n items where some are identical.