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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.
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（不要看到分情况讨论就觉得insufficient
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