There are 3 urns containing coins. Urn I contains 5 gold coins, um II contains 3 gold coins and 3 silver coins, and urn III contains 4 silver coins. An umn is selected at random and a coin is drawn from the urn. If the selected coin is gold, what is the probability that um I was selected? (Enter your probabilities as fractions.) Use a probability tree to find the probability. (b) Use Bayes' formula to find the probability.

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