Coins and weighings

Question

Among 11 coins of the same denomination, 1 is known to be counterfeit. Using a simple 2-pan balance,

determine in 2 weighings if the fake is heavier or lighter that a true coin.
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Answer: Lighter or Heavier Counterfeit, N=11
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Added: 12 June 2019, 09:28
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Answer: Determing the counterfeit's weight in 2 weighings
Answer Price: 1.50        
Added: 12 June 2019, 20:15
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