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A bag 'A' contains 5 red and 7 blue ball...

A bag 'A' contains `5` red and `7` blue balls, while the other bag 'B' contains `7` red and `4` blue balls. A ball is transferred (without noticing its colour ) from the bag 'A' to the bag 'B' . Then a ball is drawn from bag 'B' . Find the probability that the ball drawn is blue .

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