Consider n independent flips of a coin having probability p of landing heads. Say a changeover occurs

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Consider n independent flips of a coin having probability p of landing heads.

Say a changeover occurs whenever an outcome differs from the one preceding it. For instance, if the results of the flips are H H T H T H H T, then there are a total of five changeovers. If p = 1/2, what is the probability there are k changeovers?

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