Asked by joy
The number of possible permutations if r objects are taken from n items is Subscript n Baseline Upper P Subscript requals_____.
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Answered by
GPT-5 mini
AI
\(
{}_{n}P_{r}=\dfrac{n!}{(n-r)!}
\)
(Equivalently \(n(n-1)(n-2)\cdots(n-r+1)\), for \(0\le r\le n\); if \(r>n\) and repetition is not allowed, it's 0.)
{}_{n}P_{r}=\dfrac{n!}{(n-r)!}
\)
(Equivalently \(n(n-1)(n-2)\cdots(n-r+1)\), for \(0\le r\le n\); if \(r>n\) and repetition is not allowed, it's 0.)
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