Logical | job-a-thon | Question 1

Which of the following statements is NOT logically equivalent to the statement “If it is not the case that either John or Mary is at home, then both John and Mary are at work”?

(A)

 If John is at work, then Mary is at home.

(B)

If Mary is at work, then John is at home.

(C)

 If John is at home, then Mary is not at work.

(D)

If both John and Mary are at home, then at least one of them is not at work. 

Answer: (D)

Explanation:

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