math

determine the number of combinations of 7 out of 10 items. and then determine the number of combinations of 4 out of 7 items.

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asked by howard
  1. n!/(r!(n-r)!)

    10! /(7! * 3!) = 10*9*8/(3*2)=10*3*4 = 120

    7!/(4! * 3!) = 7*6*5/(3*2) =7*5 =35

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    posted by Damon

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