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Find the Fake Coin

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off left right
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your choice
red lighter
red heavier
green lighter
green heavier
blue lighter
blue heavier
all genuine
next set
You have three coins that should have the same weight. They are colored red, green, and blue so you can tell them apart. One of the coins is either heavier or lighter than the other two. Can you determine the fake coin in two weighing operations? There is also a chance that the three coins are all genuine.
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