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Urn A has 17 white and 4 red balls. Urn B has 9 white and 13...

Urn A has 17 white and 4 red balls. Urn B has 9 white and 13 red balls. We flip a fair coin. If the outcome is heads, then a ball from urn A is selected, whereas if the outcome 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? n

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