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UrnAhas 5 white and 7 black balls. UrnBhas 3 white and 12 black balls. We flip a fair coin. If the outcome is heads, then

UrnAhas 5 white and 7 black balls. UrnBhas 3 white and 12 black balls. We flip a fair coin. If the outcome is heads, then a ball from urnAis selected, whereas if the outcome is tails, then a ball from urnBis selected. Suppose that a white ball is selected. What is the probability that the coin landed tails?

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