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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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mn=12其实m和n的取值共有6种情况；lowest terms也有很多种形式，因此条件1/2分开来都不充分
只有合起来时，m=4,n=3的情况下是唯一满足条件的，因此选C
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