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Two bags A and B contain 4 white and 3 b...

Two bags A and B contain 4 white and 3 black balls and 2 white and 2 black balls respectively. Frombag A, two balls are drawn at random and then transferred to bag B. A ball is then drawn from bag B andis black is the ballfound to be a ball. What the probability that transferred were 1 white and black ?

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