4.30 (w) A drunk person wanders aimlessly along a path by going forward one step with probability 1/2 and going backward one step with probability 1/2. After 10 steps what is the probability that he has moved 2 steps forward?
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However, since the person cannot stay in place and can only move forward or backward, the only possible way is to move forward 6 times and backward 4 times. The number of ways to choose 6 steps to move forward out of 10 is given by the binomial coefficient Show more…
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