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EDIT: According to
> https://en.wikipedia.org/w/index.php?title=Balance_puzzle&ol...
if you know that one coin is different from the others, with 3 weighings, you can even detect it among 13 coins (not just 12).
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EDIT: According to
> https://en.wikipedia.org/w/index.php?title=Balance_puzzle&ol...
if you know that one coin is different from the others, with 3 weighings, you can even detect it among 13 coins (not just 12).