Now split the 12 coins into 4 groups. A,B,C & D.
Weigh A and B first, if A is heavier, we will then compare B & C, if they are equal, it shows tat A is the group that is wth a heavy counterfeit coin. Then we will take 2 coin from A to compare with the other 2 coins from A. The heavier side will then be split again to compare between each other to see which is heavier.
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