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  1. (a) There are  10C3 = 10! / (3! 7!) = 10 * 9 * 8 / (3 * 2 * 1)  = 10 * 3 * 4 = 120 ways to choose the 3 boys on the committee.    [If you need any help with the derivation, calculation, or us of these combinations formulas, I recommend this online...

    1 Answers · Science & Mathematics · 24/07/2020

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