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30 December, 05:24

Ron finds 9 books at a bookstore, he can only afford 5 of them. In how many ways can he make his selection? how many ways can he make his selection if he decides one of them is a must?

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  1. 30 December, 05:48
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    9*8*7*6*5=15120

    different ways for him to pick.
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