Bag I contains 3 red and 4 black balls and Bag II contains 4 red and 5 black balls. One ball is
Channel: Doubtnut
Date: 2020-07-05

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