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Poirot1
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(1)Consider the expected duration of the modified random walk. Show that conditioning on the first step produces a recurrence equation of the following form.
Ea = ˜pEa+1 + ˜qEa−1 + ˜c.(2)Clearly identify the values of ˜p, ˜q and ˜c in terms of p, q and r.
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