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Bag A contains 4 white and 7 black balls...

Bag A contains 4 white and 7 black balls. Bag B contains 5 white and 6 black balls. A die is rolled . If 2 or 5 turns up then choose bag A otherwise choose bag B. If one ball is drawn at random from the selected bag, then find the probability that it is black.

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The correct Answer is:
`(19)/(33)`
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