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(#5272368) Re: Four Coins: Another puzzle of 12 coins
Posted by Jools on 23 Aug 2021 at 12:04PM
I can't see it is consistently possible in 3 attempts unless you already know if the defective one is heavier or lighter. You may manage it is 3 attempts if the first attempt balances, but not if it doesn't.
Unless I'm not thinking clearly enough
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