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Bag A contains 7 red balls, and 5 blue balls.Bag B contains 5 red balls and 4 green balls.One ball is randomly drawn from A

Bag A contains 7 red balls, and 5 blue balls.Bag B contains 5 red balls and 4 green balls.One ball is randomly drawn from A and put into bag B.Then one ball is drawn from bag B randomly and put into A. Final, a ball is drawn from A at random.Find the probability that the final ball drawn from bag A is

(a) blue

(b) red

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