作者qwersony (耍人)
看板GMAT
标题[计量]GWD30-Q13
时间Wed Jul 8 23:06:50 2009
Q13:
If x + y is an integer, is y an integer?
(1) x – y is an integer.
(2) x + 2y is an integer.
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.
答案是B
WHY?
(X,Y) 不有可能也是 (1/3,1/3) or (整数,整数)吗?
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◆ From: 58.114.189.97
1F：推 scuhans:X+Y是整数阿(题干) 1/3+1/3 不是整数 07/08 23:24
2F：→ scuhans:X+Y是整数(a) X+2Y是整数(b) 07/08 23:28
3F：→ scuhans:(b)-(a) y=整数 07/08 23:28
4F：→ qwersony:THANK YOU~~ 07/09 21:31