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Anit [1.1K]
3 years ago
8

How many ways are there to select 25 books from a collection of 27 books? i am just studying today

Mathematics
1 answer:
laiz [17]3 years ago
4 0

notice, this will just be a Permutation.

\bf _nP_r=\cfrac{n!}{(n-r)!}\qquad \qquad \stackrel{\textit{25 books off a total of 27}}{_{27}P_{25}=\cfrac{27!}{(27-25)!}} \\\\\\ _{27}P_{25}=\cfrac{27!}{2!}\implies 5444434725209176080384000000

you can always check your calculator also for a [ ₙPᵣ  ] button.

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