Puzzles and Riddles - Post your best stumpers!
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(#5261405) Re: Four Coins
Posted by Jools on 23 Jul 2021 at 3:53PM
think I worked it out.
take any 2 coins and weigh them against each, they will either balance or not. Replace 1 with a 3rd coin.
if the first 2 coins balance and so does the 3rd, the remaining 4th is fake
if the first 2 coins balance and the 3rd doesn't, it is fake
if the first 2 coins don't balance, but the 3rd does, the one removed is fake
if the first 2 coins don't balance, and the 3rd doesn't, the original remaining in the balance is fake
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