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You are given three coins: one has heads on both faces, the second has tails on both faces, and the third has a head on one face and a tail on the other. You choose a coin at random and toss it, and it comes up heads. The probability that the other face is tails is

  1. $1/4$
  2. $1/3$
  3. $1/2$
  4. $2/3$
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