You have 9 coins.
6 of them are made of copper and zinc, coated with brass -
these are identical in every way. The other 3 are made of gold, also
identical in every way except for the weight of each, which is of
course slightly increased.
You have a 2-pan weighing scale and are allowed to make 3 weighings
to determine which coins are made of gold.
Can you figure out which coins are heavy? Prove it! Good luck!
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