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OpenStudy (anonymous):
Urn A has 12 white and 8 red balls. Urn B has 2 white and 17 red balls. We flip a fair coin. If the oucome is heads, then a ball from urn A is selected, whereas if the oucome is tails, then a ball from urn B is selected. Suppose that a red ball is selected. What is the probability that the coin landed heads?
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