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题库 / Prep2007E2-DS-21
Is the integer n odd?
(1) n is divisible by 3.
(2) 2n is divisible by twice as many positive integers as n.
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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odd的因子都是奇数{A}，2n的因子都是{A}*2={B},{B}和{A}不重复。
even中的因子有1和2，2n的因子会把原来的1变成2，和原来的{A}中的2重复-->本质是1会变成2.
ps: 写给自己看的···
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