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题库 / Prep2007E2-DS-19
Set S consists of five consecutive integers, and set T consists of seven consecutive integers. Is the median of the numbers in set S equal to the median of the numbers in set T ?
(1) The median of the numbers in set S is 0.
(2) The sum of the numbers in set S is equal to the sum of the numbers in set T.
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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解：因为ST都是有连续的整数构成集合，所以S=(a,a+1,a+2,a+3,a+4); T=(b,b+1,b+2,b+3,b+4,b+5,b+6)
条件一说：S的中位数是0，只能得出a=-2,不能判断T中B的值；
条件二说：S的数值值和等于T得数值值和，只能列出5a+10=7b+21，不能判断中数是否相等；但是将两个条件联立，发现可以求出B的值，这样就可以判断两个集合的中位数是否相
在gmat里往往凭感觉做题时不对的...
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