Question

Bag 1 contains 3 red balls and 4 black balls and bag 2 contains 4 red and 5 black balls. One ball is transferred from bag 1 to bag 2 and then a ball is drawn from bag 2. The ball so drawn is found to be red in colour. Find the probability that the transferred ball is black.

Answer 1

Bag 1 = 3 red ball ,

4 black

Bag 2 = 3 red ,

4 black.

3 + 4 = 7

4 + 5 = 9

7-- 9 = 2

answers is 2

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