For k=1,2,3 the box B_k contains k red balls and (k+1) white balls. Let P (B_1) =\frac{1}{2}, P (B_2) =\frac{1}{3} and P (B_3) =\frac{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

EAMCET Engineering 2008 Solved Paper

Section: Mathematics

Question : 122 of 160

Marks: +1, -0

For k=1,2,3 the box Bk contains k red balls and (k+1) white balls. Let P(B1)=‌

, P(B2)=‌

and P(B3)=‌

. 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 B2, is

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