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Asked Oct 30, 2019
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How many different selections of three books can be made from a set of fifteen books?

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Step 1

Introduction:

According to the permutation rule, if r distinct items are to be chosen from n items without replacement, in such a way that the order of selection matters, then the selection can be made in (nPr) = n! / (nr)! = n (n – 1) … (nr + 1) ways.

According to the combination rule, if r distinct items are to be chosen from n items without replacement, in such a way that the order o...

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