Random walk (3)

  1. 1. The problem statement, all variables and given/known data

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    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?
     
  2. jcsd
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