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题库 / Prep2007E1-DS-4
Is the product of a certain pair of integers even?
(1) The sum of the integers is odd.
(2) One of the integers is even and the other is odd.
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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那奇数乘奇数是奇数，偶数乘偶数是偶数啊，第一个怎么确定？
"The sum of the integers is odd.",只有一个奇数+一个偶数才可能等于奇数。所以必是一奇一偶
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