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A bag A contains 2 white and 3 black bal...

A bag A contains 2 white and 3 black balls. Another identical bag B contains 3 white and 4 black balls. First a bag, and then a ball from it, are selected at random. If the ball drawn is black, then probability that it is drawn from bag B is

A

`4/7`

B

`2/7`

C

`20/41`

D

`6/13`

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The correct Answer is:
C
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