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A fair coin is tossed for n times independently. (i) Suppose that n = 3. Given...

A fair coin is tossed for n times independently. (i) Suppose that n = 3. Given the appearance of successive heads, what is the conditional probability that successive tails never appear? (ii) Let X denote the probability that successive heads never appear. Find an explicit formula for X. (iii) Let Y denote the conditional probability that successive heads appear, given no successive heads are observed in the first n − 1 tosses. What is the limit of Y as n goes to infinity?

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