Question

Bag I contains 3 red, 4 black and 3 white balls and Bag II contains 2 red, 5 black and 2 white balls. One ball is transferred from Bag I to Bag II and then a ball is draw from Bag II. The ball so drawn is found to be black in colour. Then the probability, that the transferred ball is red, is: 

(A) 4/9 

(B) 5/18 

(C) 1/6 

(D) 3/10

Answer 1

Correct option is (B) 5/18 

A : Drown ball from boy II is black 

B : Red ball transferred