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Coin Flip variation
Posted By: Bob Koca
Date: Saturday, 2 May 2015, at 6:20 p.m.
In Response To: OFF TOPIC  A question of logic (Timothy Chow)
Here is a similar example that avoids a lot of the ambiguity of the language regarding accuracy.
Suppose that you know that two coins are both equally likely to land on either of its sides when flipped. One coin has 2 heads and the other has a head side and a tail side. One of the coins is chosen at random and flipped. If it is observed to land as a H, then what is the probability that it is the two headed coin? What if instead it was flipped N times and each time it landed as a Head?

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