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7 February, 06:19

There are 8 books in a shelf that consist of 2 paperback books and 6 hardback books. If 4 books are selected at random without replacement, how many different combinations are there that at least one paperback book is selected? A. 40B. 45C. 50D. 55E. 60

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  1. 7 February, 07:48
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    Answer:D

    Step-by-step explanation:

    This is combination.

    If 4 books selected out of eight book in the shelf:

    (4 combination 8) = 70

    For hardback selection:

    Then selection of 4 books out of the hardback, it means there is no paperbach will be:

    (4 combination 6) = 15

    So, if at least one paperback selected will be : 70-15

    That is 55
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