In Problems, use probability trees to find the probabilities of the indicated outcomes. A bag contains 5

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In Problems, use probability trees to find the probabilities of the indicated outcomes.

A bag contains 5 coins, of which 4 are fair; the remaining coin has a head on both sides. If a coin is selected at random from the bag and tossed three times, what is the probability that

(a) Heads will occur exactly twice?

(b) Heads will occur at least twice?

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