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Asked Jul 8, 2019
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3. If you read 20 books this year,
a. How many different sets of 6 books could you recommend someone to read?
b. How many different ways could you pick your #1, #2, #3 books for the year?
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of 2 3. If you read 20 books this year, a. How many different sets of 6 books could you recommend someone to read? b. How many different ways could you pick your #1, #2, #3 books for the year?

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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,

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п! "Р. (п-г)!

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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.

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Number of sets of 6 different books from 20 books = 2°P 20! (20-6) 20! 14! 27907200

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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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п! "С, г.(п-г)!

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