Question: You're given nine silver dollars, all of which are weighted equally, except one, which is 1/4 oz. lighter. If given a balance to weigh them,

  • You're given nine silver dollars, all of which are weighted equally, except one, which is 1/4 oz. lighter. If given a balance to weigh them, what is the least number of weightings needed to determine which is the light coin? Show your work.

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