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Angela Richardson

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From: UK
Registered: 6/22/11
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Posted: Aug 12, 2012 11:56 AM
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If a coin is flipped until there has been at least one head and at least one tail and gcd(number of heads,number of tails) >1, what is the expected number of flips?

I simulated 1000000 games because I couldn't be bothered to think and got a mean of 6.00584, and if the answer is 6 there ought to be some elegant proof that is eluding me.

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