Paper 1 · Logical Reasoning
UGC NET December 2022 (21.02.2023) Shift-II
Which of the following is contrary to the statement No mammals are birds?
ANo birds are mammals
BSome mammals are birds
CAll mammals are birds ✓ Correct
DSome birds are mammals
Correct answer: (C) All mammals are birds — The contrary is all mammals are birds, so the answer is all mammals are birds.
Explanation
★The contrary is all mammals are birds, so the answer is all mammals are birds.
★The given statement is the universal negative, no mammals are birds.
★Contrary statements are two universals that cannot both be true but can both be false.
★The contrary of a universal negative E is the universal affirmative A.
★Here the A proposition is all mammals are birds.
★So this A statement is the contrary of the given E statement.
★So the answer is all mammals are birds.
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