Which of the following statements are contradictory 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 & 2 only

B1 & 4 only ✓ Correct

C3 & 4 only

D1 & 3 only

Correct answer: (B) 1 & 4 only

Explanation

Statements 1 and 4 are contradictory to each other.

Statement 1 "All human beings are mortal" is an A proposition.

Statement 4 "Some human beings are not mortal" is an O proposition.

A and O are contradictories on the square of opposition.

They always take opposite truth-values, each negating the other.

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