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You have 10 bags of coins; one bag has counterfeit coins weighing 9 g each; real coins weigh 10 g. With one weighing, how do you find the counterfeit bag?
Answer
Take 1 coin from bag1, 2 from bag2, …; total deficit shows bag number
Explanation
Take 1 coin from bag1, 2 from bag2, …, 10 from bag10; weigh once. Deficit in grams = bag number.
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