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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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条件1只知道S和T各自的元素数量，完全不知道交集的情况；
条件2知道U=（S+T+交集）的元素数量，还是不知道交集的元素数量。
二者结合可以知道S\T\交集各自的元素数量。
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