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[" A bag contains,white,black and red ba...

[" A bag contains,white,black and red balls only.A ball is drawn at "],[" random from the bag.If the probability of getting a white ball is "(3)/(10)" and "],[" that of a black ball is "(2)/(5)," then find the probability of getting a red ball.If "],[" the bag contains "20" black balls,then find the total number of balls in the "]

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