Is the product mn positive? (1) m > 0 (2) n > 0
AStatement (1) alone is sufficient; (2) is not.
BStatement (2) alone is sufficient; (1) is not.
CBoth statements together are sufficient; neither alone is.
DEach statement alone is sufficient.
EStatements together are not sufficient.
Answer & Solution
Correct answer: C. Both statements together are sufficient; neither alone is.
1. Each alone gives sign of one variable. 2. Together both positive → product positive.
_Source: 501-GMAT-Questions Ch DS / Manhattan Quant Bank_
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