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Mathematics, 13.07.2019 22:10 Senotora

Suppose there is a box containing 9 white balls, 3 black balls, and 4 red balls. is it possible to add the same number of balls of each color to the box so that when a ball is drawn at random the probability of the event that is a black ball is the following? a) 1/3
b) 0.24
explain what number needs to be added to get this answer!

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