Which of the following statements are contrary to each other?

1.All human beings are mortal

2.No human beings are mortal

3.Some human beings are mortal

4.Some human beings are not mortal

A1 & 4 only

B2 & 3 only

C1 & 2 only ✓ Correct

D1 & 3 only

Correct answer: (C) 1 & 2 only

Explanation

All human beings are mortal and No human beings are mortal are the two contraries.

Contrariety in the square holds between the universal affirmative A and the universal negative E.

Statement 1 is A and Statement 2 is E.

These two cannot both be true, though both could be false.

The particulars in Statements 3 and 4 are subcontraries, not contraries.

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