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A stock price can go up or down by a dollar a day. The probability of a unit increase is .5. What is the probability

A stock price can go up or down by a dollar a day. The probability of a unit increase is .5. What is the probability that the stock price increases by $30 before decreasing from the present value by $40? How many days are expected to elapse before the stock increases by $30 while still avoiding a decrease of $40?

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