Question

Asked Oct 30, 2019

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How many different selections of three books can be made from a set of fifteen books?

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*! / (*n* – *r*)! = *n* (*n* – 1) … (*n* – *r* + 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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