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There are eight silver coins and one counterfeit coin. that looks like a silver coin but actually weighs slightly less than the others. By using a balance scale to compare coins (or groups of coins) whats the minimum number of times you have to use the scale to guarantee that you find the lightest coin? Explain your answe
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Interviewed at IBM

3.9
Feb 2, 2010

There are eight silver coins and one counterfeit coin. that looks like a silver coin but actually weighs slightly less than the others. By using a balance scale to compare coins (or groups of coins) whats the minimum number of times you have to use the scale to guarantee that you find the lightest coin? Explain your answe

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