- #1

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## Homework Statement

http://img171.imageshack.us/img171/4711/52047019pc2.png [Broken]

## Homework Statement

## Homework Equations

Random walk equations: X

_{i}is i.i.d. and [tex]S_n = X_1+...+X_n[/tex] and S

_{0}=0

## The Attempt at a Solution

I don't have a idea where to begin. I couldn't start because I don't know how to apply the random walk.

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