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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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不要漏看题目条件 正整数n
（1）6根号k是整数，则根号k是整数，所以可以
（2）举例n=12、n=1
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