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One urn contains 12 blue balls and 7 white balls, and a second urn contains 8 blue balls and 19 white balls. An urn is

One urn contains 12 blue balls and 7 white balls, and a second urn contains 8 blue balls and 19 white balls. An urn is selected at random, and a ball is chosen from the urn. (a) What is the probability that the chosen ball is blue? (b) If the chosen ball is blue, what is the probability that it came from the first urn?

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