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a) how many red balls must be added to the box so that the probability of drawing a red ball is 8/9?
b) how many black balls must be added to the original box so that the probability of drawing a white ball is 1/9?

 Sep 12, 2020
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a) 4 red balls must be added

 

b) 11 black balls mus be added.

 Sep 12, 2020

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