(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

3. The attempt at a solution

My difficulty is in the difference equation I don't understand how to prove it. I think you have to condition since I see something like *P(X_i=1) = p and *P(X_i=-1) = q.

Can someone help me, please?

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# Random walk (3)

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