Question: Help appreciated Exercise 10.20 Consider a simple random walk with p # q. Show that, conditional on the walk return- ing to its starting point

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Exercise 10.20 Consider a simple random walk with p # q. Show that, conditional on the walk return- ing to its starting point at some time, the expected number of steps taken before this occurs is 4pq Ip - ql(1 - |p - ql)

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