You have 12 coins, but one is counterfeit and is either heavier or lighter than the rest.
You also have a balance scale and can only use it three times.
How do you find the counterfeit coin and determine whether it is heavier or lighter?
Divide the 12 coins into three groups:
Weigh Group A against Group B.
👉 You can always find the counterfeit coin and determine if it’s heavier or lighter in exactly 3 weighings.
You have 12 coins, but one is counterfeit and is either heavier or lighter than the rest.
You also have a balance scale and can only use it three times.
How do you find the counterfeit coin and determine whether it is heavier or lighter?
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