Question: Two drunks start out together at the origin, each having equal probability of making & step to the left or right along the z

Two drunks start out together at the origin, each having equal probability

Two drunks start out together at the origin, each having equal probability of making & step to the left or right along the z axis. Find the probability that they meet again after N steps. It is to be understood that the men inake their steps simultaneously. (It may be helpful to consider their relative motion.)

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