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by gkfasdfasdf
2916 days ago
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I'm going to have to take this riddle bait. My solution: Move 1: weigh 6 coins vs 6 coins. Isolate the heavier set for the next move.
Move 2: weigh 3 coins vs 3 coins. Isolate the heavier set for the next move.
Move 3: weigh any two of the 3 remaining coins. If one is heavier, that is the counterfeit. Otherwise (if coins are equal in weight) the remaining coin is counterfeit. |
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> One is counterfeit and is either heavier or lighter
It turned out the counterfeit was lighter and you discarded it after the first weighing.