Question: Sue has two coins. One is fair, with a head on one side and a tail on the other. The second is a trick coin

Sue has two coins. One is fair, with a head on one side and a tail on the other. The second is a trick coin and has a tail on both sides. Sue picks up one of the coins at random and flips it. a Find the probability that it lands heads up. b Given that it lands tails up, find the probability that she picked up the fair coin.

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