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标题: 天山-9-32 [打印本页]

作者: bobochen    时间: 2005-8-23 18:36
标题: 天山-9-32

Q32:
If S is a set of ten consecutive integers, is the integer 5 in S?
(1)   The integer –3 is in S.
(2)   The integer 4 is in S.
   
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.


我选C,正确选E. 我开始是这样考虑的,条件1,2 放在一起的集合为{ -3,-2,-1,0,1,2,3,4,5,6}; 选E的原因是否为-3 和4 分别往其更小的方向走,所以就没有5在集合中了。不知我的思路是否正确??



作者: happyfish0517    时间: 2005-8-23 20:13

即使-3和4都在这个数列中,也不能保证5肯定在此数列中


又没有说,-3是这个数列中的第一个数字,也没有说4是这个数列中最后一个数字






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