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题库 / Prep2007E2-DS-39
If c and d are integers, is c even?
(1) c(d + 1) is even.
(2) (c + 2)(d + 4) is even.
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.
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
如果需要分情况讨论的两种情况都是一个结果，那么就可以确定
（不要看到分情况讨论就觉得insufficient
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