A box contains 6 white balls, 4 black balls and 1 red balls. How many red balls must be added...
pheome2A box contains 6 white balls, 4 black balls and 1 red balls. How many red balls must be added to the box so that the proability of drawing a red ball is 7/8? How many black balls must be added to the original box so that the probability of drawing a white ball is 1/8?
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