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  3. What is the contrapositive of the relation represented in the exhibit shown below? ( )

What is the contrapositive of the relation represented in the exhibit shown below? ( )

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问题 What is the contrapositive of the relation represented in the exhibit shown below? (    )
选项 A、R={＜1,2＞,＜1,3＞,＜1,4＞,＜1,5＞}
B、R={＜1,1＞,＜2,2＞,＜3,3＞,＜4,4＞,＜5,5＞}
C、R={＜2,1＞,＜4,1＞,＜2,2＞,＜1,3＞,＜3,2＞,＜1,4＞,＜4,4＞,＜5,4＞}
D、R={＜1,2＞,＜3,1＞,＜1,4＞,＜2,2＞,＜2,3＞,＜4,1＞,＜4,4＞,＜4,5＞}
答案C
解析
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NCRE全国计算机四级

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