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raleung2

  • 3 years ago

from a collection of 9 books, martin is asked to list his 5 favorites starting with his most favorite, second favorite, 3rd favorite and so on. How many ways can martin make his list?

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  1. anonymous
    • 3 years ago
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    \[9\times 8\times 7\times 6\times 5\]

  2. kropot72
    • 3 years ago
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    \[nPr=\frac{n!}{(n-r)!}=\frac{9!}{4!}=9\times 8\times 7\times 6\times 5\]=15120 ways

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