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题库 / Prep2007E2-DS-32
Is positive integer n divisible by 3 ?
(1) ~$\frac{n^{2}}{36}$~ is an integer.
(2) ~$\frac{144}{n^{2}}$~ is an integer.
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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2）里面，只要含有任何一个144的因子就可以，和1）不一样，不一定有3的。
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