A gambler repeatedly plays a game where in each round he


Question: A gambler repeatedly plays a game where in each round, he wins a dollar with probability 1/3 and loses a dollar with probability 2/3. His strategy is "quit when he is ahead by $2," though some suspect he is a gambling addict anyway. Suppose that he starts with a million dollars. Show that the probability that he'll ever be ahead by $2 is less than ¼.

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Basic Statistics: A gambler repeatedly plays a game where in each round he
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