Hint: First number the coins from 1 to 12, and divide them into 3 groups...
I first heard this puzzle from Anthony while Peter and I were visiting his antique shop in Grays Market in London. In the beginning I thought this should be easy. But I could not solve it there. I was still thinking about this puzzle when we were visiting the British Museum later on that day.
The next morning we were at the Heathow Airport waiting for our flight home. On a piece of paper I numbered the coins and started a flow chart of weighing results. The solution came and it was beautiful!
See the solution to the 12 coins puzzle.
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