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There are 3 urns containing coins. Urn I contains7gold coins, urn II contains3gold coins and3silver coins, and urn III contains2silver coins. An urn is selected

There are 3 urns containing coins. Urn I contains7gold coins, urn II contains3gold coins and3silver coins, and urn III contains2silver coins. An urn is selected at random and a coin is drawn from the urn. If the selected coin issilver, what is the probability that urnIIIwas selected? (Enter your probabilities as fractions.)

(a) Use a probability tree to find the probability.

(b) Use Bayes' formula to find the probability.

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