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Bag A contains 3 white, 7 red balls and Bag B contains 3 white, 2 red balls. One bag is selected at random and a ball is drawn from it. The probability of drawing the ball from the bag A, if the ball drawn is white, is

1. 3 1
2. 4 1
3. 9 1
4. 10 3

Correct answer: 3 1

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