A bag contains white, black,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 numbers of balls in the bag.
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100 is the right answer man
saeepalekar5:
Can u explain it fully
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the right answer is 100
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