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

1.All mushrooms are fungi

2.No mushrooms are fungi

3.Some mushrooms are fungi

4.Some mushrooms are not fungi

A3 & 4 only ✓ Correct

B1 & 2 only

C1 & 3 only

D2 & 4 only

Correct answer: (A) 3 & 4 only

Explanation

Statement 3 and Statement 4 cannot both be false though they may both be true.

That description defines the relation of subcontrariety.

Statement 3 is the particular affirmative I, Some mushrooms are fungi.

Statement 4 is the particular negative O, Some mushrooms are not fungi.

The two particulars I and O are subcontraries on the square of opposition.

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