There are 10 coins out of which 1 coin is counterfeit coin how to find that coin in one measure?
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You can’t if it’s the same size and weight as the real ones.
it would be very difficult if it is a good counterfeit because then it matches in look, size and also in weight.
if the coin is valuable enough then it is a good idea to check on the metal or the alloy.
Put them all in water, see if one of them floats or takes longer to sink.