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Bag B 1 contains 6 white and 4 blue balls, Bag B 2 contains 4 white and 6 blue balls, and Bag B 3 contains 5 white and 5 blue balls. One of the bags is selected at random and a ball is drawn from it. If the ball is white, then the probability, that the ball is drawn from Bag B 2 , is :

1. 3 1
2. 15 4
3. 3 2
4. 5 2

Correct answer: 15 4

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