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Donald has in his pocket three coins: two fair coins and a two-headed coin. He selects...

Donald has in his pocket three coins: two fair coins and a two-headed coin. He selects one of the coins at random; when he tosses it, it shows head. What is the probability that the selected coin is a two-headed coin? Select one: a. 0.5 b. 0.75 c. 0.25 d. 0.333

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