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Need help 1) Fix n E N. Find the probability that a symmetric random walk on Z starting from 0 reaches n or +71 before

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1) Fix n E N. Find the probability that a symmetric random walk on Z starting from 0 reaches n or +71 before it returns to 0. Use the result on the absorption probability for a walk on {0, 1, . . . ,n}, which you should state (but need not derive)

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