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题库 / GMATAdvanced-DS-5
What is the number of integers that are common to both set S and set T ?
(1) The number of integers in S is 7, and the number of integers in T is 6.
(2) U is the set of integers that are in S only or in T only or in both, and the number of integers in U is 10.
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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韦恩图：
s+d=7, t+d=6, s+d+t=10，求d=？
用三个不同的方程式解一元三次方程，能解出来。将s和t都转换成d的表达式，归在三者相加等于10那个方程式里。
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