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If you have 2 coins in your pocket (one is double-headed, and the other is a fair coin), you grab a random coin from your pocket and see that one face is a head. What is the probability that if you flip the coin, the other face is also a head (i.e. that you picked the double-headed coin)?
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Financial Software Developer

Interviewed at Bloomberg

4
May 8, 2010

If you have 2 coins in your pocket (one is double-headed, and the other is a fair coin), you grab a random coin from your pocket and see that one face is a head. What is the probability that if you flip the coin, the other face is also a head (i.e. that you picked the double-headed coin)?

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