Prove that with the notations of section 2: (a) In a random walk starting at the origin

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Prove that with the notations of section 2:

(a) In a random walk starting at the origin the probability to reach the point a> 0 before returning to the origin equals p(1-91).

(b) In a random walk starting at a>0 the probability to reach the origin before returning to the starting point equals 99a-1

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