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GMAT数学

if a and b are positive integers such that a-b and a/b are both even integers,which of the following must be an odd integer? A a/2 B b/2 C (a+b)/2 D (a+2)/2 E (b+2)/2

根据题的要求要让a-b和a/b都是偶数的话a和b得是同偶啊，那选项里面似乎D 和E一起选才可以耶，
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