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27 Feb 2017, 04:32
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
55% (01:18) correct
45%
(01:28)
wrong
based on 233
sessions
History
Date
Time
Result
Not Attempted Yet
27 Feb 2017, 09:16
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Bunuel
Target question: Is d ≠ e ?
This is a good candidate for rephrasing the target question.
If d = e, then we can say that d - e = 0
Likewise, if d ≠ e then we can say that d - e ≠ 0
REPHRASED target question: Is d - e ≠ 0 ?
Statement 1: d > e + 1
Subtract e from both sides to get: d - e > 1
If d - e is GREATER THAN 1, we can be certain that d - e will NEVER EQUAL ZERO.
In other words, d - e ≠ 0
Since we can answer the REPHRASED target question with certainty, statement 1 is SUFFICIENT
Statement 2: d < e + 2
Subtract e from both sides to get: d - e < 2
If d - e is LESS THAN 2, it's POSSIBLE that d - e = 0, and it's POSSIBLE that d - e ≠ 0
Since we cannot answer the REPHRASED target question with certainty, statement 2 is NOT SUFFICIENT
Answer: A
ASIDE: If you're not convinced that statement 2 is not sufficient, consider these two cases that yield contradictory answers to the target question:
Case a: d = 3 and e = 2. In this case, d - e ≠ 0
Case b: d = 3 and e = 3. In this case, d - e = 0
RELATED VIDEO FROM OUR COURSE
General Discussion
27 Feb 2017, 08:35
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Bunuel
Question: Is d ≠ e ?
Statement 1: d > e + 1
i.e. d > 1
SUFFICIENT
Statement 2: d < e + 2
i.e. d and e may be equal and may be different too
NOT SUFFICIENT
Answer: Option A
