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Q2. 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 balls is 3/10 and that of black 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 bag.

Q1. A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is thrice that of drawing  a red ball, determine the number of blue balls in the bag