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Suppose flipping a coin with probability $p$ to get a head. Suppose we flip it until a head appear. What is the mean number of flip required getting a head? (Better to use conditional expectation to show the mean)

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    What do you mean by the last sentence? Is it a question?2012-09-29
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    Ya, but i am asking if someone can use conditional expectation to solve the problem2012-09-29

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