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Asked Jul 8, 2019

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Step 1

Total number of books read this year, *n = *20

(a) To find the number of different sets of 6 books that could be recommended.

The number of possibilities to select *r* objects from *n* is given by the formula,

Step 2

Thus the number of different sets of 6 books means selecting 6 books from the set of 20 books randomly. Therefore the total number of such 6 pairs will be calculated as follows.

Step 3

(b) To find the number of different ways to pick first book, second book and third book.

The number...

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