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-   -   Random walk (3) (http://www.physicsforums.com/showthread.php?t=276195)

dirk_mec1 Dec1-08 10:33 AM

random walk (3)
 
1. The problem statement, all variables and given/known data

http://img171.imageshack.us/img171/6470/42057811eo4.png

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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