There are two coins in a bag. For Coin 1, P(H) = 1/2 and for Coin 2,

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There are two coins in a bag. For Coin 1, P(H) = 1/2 and for Coin 2, P(H) = 1/3. Your friend chooses one of the coins at random and tosses it 5 times.

a. What is the probability of observing at least 3 heads?

b. * You ask your friend: "Did you observe at least three heads?". Your friend replies, "Yes." What is the probability that Coin 2 had been chosen?

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