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GMAT的数学DS题目,答案会不唯一么?
GWD的题目,答案是D, 但是两个条件推出的结论虽然都唯一,但是是矛盾的.....记得好像GMAT说过答案应该是唯一不矛盾的吧?请高手指点.
If ab = 1, what is the value of (axb)(ayb)?
(1)ax = by = 2
(2) 2xy = 4
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Answer: D?
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