There are 3 urns containing 3 white and 4 green balls; 2 white and 4 green balls; 1 white and 1 green ball. One urn is chosen at random and a ball is drawn from it. What is the probability that it is a green ball?

A:43/126
B:4/21
C:7/12
D:73/126
Answer: D

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    A can any one solve it...


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