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Source: Beat The GMAT — Data Sufficiency |
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If the product of a set of numbers is negative, that only means you have an odd number of negatives (since every pair of negatives will multiply to give you a positive number). So if we have six elements in our set, and our product is negative, we might have 1, 3 or 5 negative numbers in our set. So even using both statements, we cannot answer the question - E.
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