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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 at the same time?

 Dec 26, 2020
edited by Guest  Dec 26, 2020
 #1
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She can  choose either the green of prurple one and from  the  other 9, she can choose any 2

 

So

 

2  *  C(9,2)   =   72  ways

 

cool cool cool

 Dec 26, 2020

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