Which of the following propositions are contrary to each other?

1.All fishes are mammals

2.Some fishes are mammals

3.No fishes are mammals

4.Some fishes are not mammals

A2 & 4 only

B1 & 3 only ✓ Correct

C1 & 4 only

D2 & 3 only

Correct answer: (B) 1 & 3 only

Explanation

Statement 1 and Statement 3 are the contrary pair here.

Statement 1 is the universal affirmative A, All fishes are mammals.

Statement 3 is the universal negative E, No fishes are mammals.

Two universals of opposite quality are contraries on the square.

They cannot both be true though they may both be false.

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