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[problem] Consider n independent flips of a coin having prob p of landing heads. Say a changeover occurs whenever an outcome differs from the one preceding it. E.g., H H T H T H H T means 5 changeovers. What is the expected number of changeovers for an arbitrary p?

[s0lution]

see attachment.

[s0lution]

see attachment.

**WHERE is the exponential coming from?**