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

1.Some women are multitaskers

2.All women are multitaskers

3.Some women are not multitaskers

4.No women are multitaskers

A2 & 3 only

B2 & 4 only

C1 & 4 only

D1 & 3 only ✓ Correct

Correct answer: (D) 1 & 3 only

Explanation

Statements 1 and 3 are subcontraries, which cannot both be false.

Statement 1 "Some women are multitaskers" is an I proposition.

Statement 3 "Some women are not multitaskers" is an O proposition.

On the square, I and O are subcontraries: at least one must be true.

Yet both may hold together, so they can both be true at once.

That "not both false, possibly both true" pattern defines subcontrariety.

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