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题库 / Prep2007E1-DS-54
Is x - y + 1 greater than x + y - 1 ?
(1) x > 0
(2) y < 0
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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两式比较大小，则用相减后与零比较大小
Is x - y + 1 greater than x + y - 1 ?
-> x - y + 1 - (x + y - 1) > 0?
-> -2y -2 >0
-> -2y >2
-> y < -1
Thus x - y + 1 is greater than x + y - 1, when y<-1. Statement (2) y<0 is not sufficient, nor does (1).
So the answer should be E.