Which statement is the negation of "The office is open and the clerk is present"?

Correct answer: C. The office is not open, or the clerk is not present.

An "and" statement is false when at least one part is false. So its negation is "not the first, or not the second". This rule is known as De Morgan's law.

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Answer and explanation

The correct answer is C. The office is not open, or the clerk is not present.

An "and" statement is false when at least one part is false. So its negation is "not the first, or not the second". This rule is known as De Morgan's law.

Topic: Syllogisms and Deductive Reasoning MCQs · Subject: Analytical Ability