A particle moves along the line in a random walk. That is, the particle starts at the origin (position 0) and moves either right or left in independent steps of length 1. If the particle moves to the right with probability 0.6, its movement at the ith step is a random variable X; with distribution P(X; = 1) = 0.6 , P(X; = –1) = 0.4.

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