Paper 1 · Logical Reasoning
The quantity of a proposition is determined by the extension of the
ASubject ✓ Correct
BPredicate
CBoth subject and predicate
DCopula
Correct answer: (A) Subject — Quantity is fixed by the extension of the subject, so that is the answer.
Explanation
★Quantity is fixed by the extension of the subject, so that is the answer.
★Whether a proposition is universal or particular depends on how much of the subject it covers.
★'All' takes the whole extension of the subject; 'some' takes only part.
★So the subject's extension settles the quantity.
★The predicate's extension bears on distribution, not on quantity.
★So the answer is subject.
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