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A student is given a reading list of nine books from which he must select three for an outside reading requirement. In how many ways can he make his selections?

Answer :

Basically you have to multiply 9x8 for the numerator, and the denominator is 3x2 so as you know 9x8 is 72 divide that by 3x2 is 6 and you get 72/6=12

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