Which of the following statements is logically equivalent to No birds are mammals?
ASome birds are not mammals
BSome non-birds are mammals
CNo mammals are birds ✓ Correct
DAll non-birds are mammals
Correct answer: (C) No mammals are birds
Explanation
The equivalent statement is No mammals are birds.
The original is the E proposition No birds are mammals.
An E proposition converts simply, keeping the same quantity and quality.
Interchanging subject and predicate turns No birds are mammals into No mammals are birds.
An E proposition and its converse are logically equivalent, giving No mammals are birds.
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