Multiple choice

How many selections of 4 books can be made from 8 different books?

  1. 70

  2. 71

  3. 72

  4. 73
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A Correct answer
Explanation

Number of ways to select 4 books from 8 = 8C4 = (8*7*6*5) / (4*3*2*1) = 70.

AI explanation

This question requires finding the number of combinations of 8 different books taken 4 at a time. Using the combination formula nCr, we calculate 8C4 as 8! divided by (4! multiplied by 4!). This evaluates to (8 times 7 times 6 times 5) divided by (4 times 3 times 2 times 1), which equals 1680 divided by 24. The result is 70.

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