Which of the following statements are so related that they cannot both be false, though they can both be true?

1.Some saints are materialists.

2.All saints are materialists.

3.No saints are materialists.

4.Some saints are not materialists.

A1 & 3 only

B1 & 4 only ✓ Correct

C3 & 4 only

D2 & 4 only

Correct answer: (B) 1 & 4 only

Explanation

Statements 1 and 4 cannot both be false yet can both be true, being subcontraries.

Statement 1, some saints are materialists, is the I form.

Statement 4, some saints are not materialists, is the O form.

I and O stand as subcontraries on the square of opposition.

Subcontraries may be true together but can never be false together.

Want more like this? Create a free account to practise a full test, track your progress, and get spaced-repetition review.