this is not a homework question, it was a interview question(adsbygoogle = window.adsbygoogle || []).push({});

Question:

suppose we keep flipping an unbiased coin every second, how long do you have to wait on average before you get two heads in a row.

similar question here http://www.wilmott.com/messageview.cfm?catid=26&threadid=16483 [Broken] but i dont follow their arguments

hoping someone could help me out

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# Expected stopping time

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