Question : There are 3 bags which are known to contain 2 white and 3 black, 4 white and 1 black, and 3 white and 7 black balls, respectively. A ball is drawn at random from one of the bags and found to be a black ball. Then the probability that it was drawn from the bag containing the most black ball is
(A) 7/15
(B) 5/19
(C) 3/4
(D) none of these
Answer : option (A)
Solution :
