Paper 1 · Logical Reasoning
UGC NET December 2022 (23.02.2023) Shift-II
Which of the following statements are so related that they cannot both be false, although they may both be true?
- All mushrooms are fungi
- No mushrooms are fungi
- Some mushrooms are fungi
- Some mushrooms are not fungi
A3 & 4 only ✓ Correct
B1 & 2 only
C1 & 3 only
D2 & 4 only
Correct answer: (A) 3 & 4 only — The subcontrary pair is Some are fungi and Some are not fungi, so the answer is 3 and 4.
Explanation
★The subcontrary pair is Some are fungi and Some are not fungi, so the answer is 3 and 4.
★Two subcontrary statements cannot both be false, though both can be true.
★Statement 3 is the particular affirmative, Some mushrooms are fungi.
★Statement 4 is the particular negative, Some mushrooms are not fungi.
★These two particulars are subcontraries.
★They cannot both be false at once, yet both can be true together.
★So the answer is items 3 and 4.
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