Civil Service Exam Reviewer · Logical Reasoning · hard
Data sufficiency: Is Q a positive number? (1) Q² = 9. (2) Q³ = −27. Which of the following is correct?
- Statement (1) ALONE is sufficient, but statement (2) alone is not.
- Statement (2) ALONE is sufficient, but statement (1) alone is not.
- BOTH statements TOGETHER are sufficient, but NEITHER alone is.
- The statements are NOT sufficient, even when taken together.
Answer
B. Statement (2) ALONE is sufficient, but statement (1) alone is not.
Solution
The answer is: Statement (2) ALONE is sufficient, but statement (1) alone is not. (1) Q could be 3 or −3 — not sufficient. (2) Q = −3, so the answer is a definite "no" — sufficient. (A definite "no" still answers the question.)
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