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raleung2
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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?
 2 years ago
 2 years ago
raleung2 Group Title
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?
 2 years ago
 2 years ago

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satellite73 Group TitleBest ResponseYou've already chosen the best response.0
\[9\times 8\times 7\times 6\times 5\]
 2 years ago

kropot72 Group TitleBest ResponseYou've already chosen the best response.1
\[nPr=\frac{n!}{(nr)!}=\frac{9!}{4!}=9\times 8\times 7\times 6\times 5\]=15120 ways
 2 years ago
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