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Question: sn denotes the position is at during the nth time...

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0) c 10.10 Show that un = P(S,-So) satisfies un adeduce that an asymmetric random walk revisits its starting point only finitely often w a will need Stirlings formula (see TheoremA 4): n (n/e) /2π n as n You Exercise 10.11 Consider a two-dimoSn denotes the position is at during the nth time of the random walk. For example, if you're on the 3rd position at the 10th time, S10 = 3.

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