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there is a machine that produces 10 gram coins and bags them. there are 10 coins in a bag. the machine has produced 9 bags containing 10 of the 10 gram coins when an error occurs. it produces a bag containing ten 9 gram coins. due to the error, all of the bags have been mixed together so one can be distinguished from the other. there is a scale available but you can only use it once. how can you tell which bag contains the ten 9 gram coins in it?
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