Q9:
If x and z are integers, is at least one of them even?
(1) x + z is odd.
(2) x - z is odd.
奇怪了,为什么这题所有的答案都是D呢?
(1)如果x=0, z=odd,两个条件都符合,没有一个偶数;
(2)x=odd,z=even,有一个偶数
明显答案应该是E啊?
0是偶数。
x和z只可能一机一偶阿,怎么是at least one of them is even 呢?像这种题是判断
上面这句话的可能性么?
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