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A student takes a step of unit length in the positive direction with probability 2/3 and a step of unit length in the negative

A student takes a step of unit length in the positive direction with probability 2/3 and a step of unit length in the negative direction with probability 1/3. The mean displacement of the student after n step is (a) n/3 (b) n/8 (c) 2n/3 (d) 0

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