If a and b are positive integers such thatand are both even integers, which of the following must be an odd integer?_出国考试答疑器_GMAT_试题

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题目：

If a and b are positive integers such that

and

are both even integers, which of the following must be an odd integer?

选项:

A、

B、

C、

D、

E、

答案:

D

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我怎么觉得a和b都是偶数才行？

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