Mr. Smith bought a number of shares of a particular stock. Assume that each working day, the

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Mr. Smith bought a number of shares of a particular stock. Assume that each working day, the price per share drops with a probability of 0.4 and rises with a probability of 0.6. Mr. Smith has decided to sell all shares right away after the third drop. How many days on the average will Mr. Smith keep the shares?

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