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GMAT Practice Question for August 21st

Researchers recently discovered an unusually high concentration of harmful metals in the water supply of Dunbarton County. They further found that, with a costly new water filter system installed in their homes, residents were able to filter out almost all of the harmful metals in the water supply. For this reason, all the residents of Dunbarton County should have the filter system installed in their homes, regardless of expense.

If true, which of the following would most weaken the above conclusion?

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Question ID: 95