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JonTroncoso · Answer 1 · 2019-03-03T15:53:20+0000

$\bf _nP_r=\cfrac{n!}{(n-r)!}\qquad \qquad \qquad _9P_5=\cfrac{9!}{(9-5)!}$

check your calculator for the [!] factorial button.

also bear in mind that most calculators also have an [ₙPᵣ] button, to get Permuations, and you can just use that.

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