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)
Showing by conditional expectation
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0What do you mean by the last sentence? Is it a question? – 2012-09-29
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0Ya, but i am asking if someone can use conditional expectation to solve the problem – 2012-09-29