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

1.All metals are gases

2.Some metals are gases

3.Some metals are not gases

4.No metals are gases

A1 & 4 only

B2 & 3 only ✓ Correct

C1 & 2 only

D3 & 4 only

Correct answer: (B) 2 & 3 only

Explanation

Statement 2 and Statement 3 cannot both be false though they may both be true.

That description defines subcontrariety.

Statement 2 is the particular affirmative I, Some metals are gases.

Statement 3 is the particular negative O, Some metals are not gases.

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

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