Is x an integer? (1) 2x is an integer (2) x² is an integer
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: A. Statement (1) alone is sufficient; (2) is not.
1. 2x integer allows x = 0.5. 2. x² integer allows x = √2. Together still no certainty. Answer: E.
_Source: 501-GMAT-Questions Ch DS / Manhattan Quant Bank_
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