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20. Let ∇ denote a mathematical operation. Is it true that x ∇ y = ... ...

Let ∇ denote a mathematical operation. Is it true that x ∇ y = y ∇ x for all x and y?

(1) image

(2) x ∇ y = x − y


(A) if statement (1) ALONE is sufficient to answer the question but statement (2) alone is not sufficient;
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Press: Set C - More Practice

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Replies to This Thread: 1 | ----
20. Let ∇ denote a mathematical operation. Is it true that x ∇ y = ... ... 
Posted: 10/12/2013 15:43
You said that (2) answer the question with NO for all values of x and y, but it is not true. If x = y, then x-y = y-x = 0, answering the question with YES. So the correct answer should be A, no?!
Contributor
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Replies to This Thread: 0 | ----
 
Posted: 11/01/2013 14:40
Raquel, this question is invalid. We will fix it in the next update. Sorry for the confusion. In Data Sufficiency questions, Statements 1 and 2 should not contradict each other.
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