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A time traveler can take 4 books with him, and he has 86 books to choose from. How many differentways can the books be selected?

A time traveler can take 4 books with him, and he has 86 books to choose from. How many differentways can the books be selected?
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A time traveler can take 4 books with him, and he has 86 books to choose from. How many differentways can the books be selected?

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User Msanford
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1 Answer

6 votes

Combination:


_nC_r=(n!)/(r!(n-r)!)

n is the number of things to choose from, and r is the number of thing

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User Mjdth
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