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题库 / GMATAdvanced-DS-77
If m and n are positive integers,what is the value of ~$\frac{3}{m}$~+~$\frac{n}{4}$~?
(1)mn=12
(2)3/m is in lowest terms and n/4 is in lowest terms.
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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先把mn=12通过因数方法的把m，n的所有组合列出来，再用(2)去筛，最后只剩下一组解符合要求。
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