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For k=1,2,3 the box Bk contains k red ba...

For `k=1,2,3` the box `B_k` contains k red balls and `(k+1)` white balls. Let `P(B_1)=1/2,P(B_2)=1/3 and P(B_3)=1/6`.A box is selected at random and a ball is drawn from it. If a red ball is drawn, then the probability that it has come from box `B_2`, is

A

`35/78`

B

`14/39`

C

`10/13`

D

`12/13`

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B
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