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A bag contain {n} ball out of which some balls are white. If p
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A bag contain ball out of which some balls are white. If probability that a bag contains exactly white ball is proportional to . A ball is drawn at random from the bag and found to be white, then find the probability that bag contains exactly 2 white balls.

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A bag contain ball out of which some balls are white. If probability that a bag contains exactly white ball is proportional to . A ball is drawn at random from the bag and found to be white, then find the probability that bag contains exactly 2 white balls.
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Question Text
A bag contain ball out of which some balls are white. If probability that a bag contains exactly white ball is proportional to . A ball is drawn at random from the bag and found to be white, then find the probability that bag contains exactly 2 white balls.