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12 Coin puzzle

  1. Apr 8, 2010 #1
    12 Coins. One of the coins is counterfeit. The counterfeit coin is either heavier or lighter than the good ones. You have a simple balance. With just 3 trips (three weighings) to the balance isolate the counterfeit coin and tell if it is heavier or lighter. No extra weights for the balance.
  2. jcsd
  3. Apr 10, 2010 #2
    Sorry, previously submitted and answered. i should have done a search.
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