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A drunk starts out from a lamppost in the middle of a street, taking steps of...

A drunk starts out from a lamppost in the middle of a street, taking steps of equal length either to the right or to the left with equal probability. What is the probability that the man will again be at the lamppost after taking N steps

a. If N is even?

b. If N is odd?

Math   Statistics-And-Probability   
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