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题目内容 (请给出正确答案)
单选题
Which of the following numbers provides a counterexample to the statement above?
A

9

B

12

C

13

D

14

E

15


参考答案

参考解析
解析:
为证明所有3的倍数为奇数这个陈述是错误的。需要证明至少有一个3的倍数不是奇数。选项中只有12是3的倍数且不是奇数。
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