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A bag contains 5 white and 3 black balls...

A bag contains 5 white and 3 black balls, a second bag contains 4 white and 5 black balls, a third bag contains 3 white and 6 black balls. A bag is selected at rendom and a ball is drawn. Find the probability that the ball is black.
Do the problem assuming that the probability of choosing each bag is same.

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