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Physics, Statistical Physics
Year 2
Find the probability that they meet again after N steps.
This is from Reif's Statistical and Thermal Physics:
Two drunks start out together at the origin, each having equal probability of making a step to the left or right along the x-axis. Find the probability that they meet again after N steps. It is to be understood that the men make their steps simultaneously. (It may be helpful to consider their relative motion).
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