Which of the following propositions are so related that they cannot both be false, although they may both be true?
1.All tigers are man-eaters
2.Some tigers are man-eaters
3.Some tigers are not man-eaters
4.No tigers are man-eaters
A2 & 3 only ✓ Correct
B3 & 4 only
C1 & 4 only
D1 & 3 only
Correct answer: (A) 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 tigers are man-eaters.
Statement 3 is the particular negative O, Some tigers are not man-eaters.
I and O, the two particulars, are subcontraries on the square of opposition.
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