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Liz has 11 marbles of different colors. In how many ways can she choose 3 of the marbles, if she refuses to choose the green one and the purple one and the blue one?

 Jun 1, 2021
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If  we can't  have   any of  the  3 colors, then chose  any 3 of the remaining 8   =  C(8,3)  = 56 ways

 

cool cool cool

 Jun 1, 2021

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