Paper 1 · Logical Reasoning
The relation between two particular propositions that have the same subject and predicate but differ in quality is
AContrary
BContradictory
CSub-alternation
DSub-contrary ✓ Correct
Correct answer: (D) Sub-contrary — Two particulars differing in quality are sub-contraries, so that is the answer.
Explanation
★Two particulars differing in quality are sub-contraries, so that is the answer.
★The I and O propositions share subject and predicate but differ in quality.
★This I-O relation is called sub-contrary opposition.
★Sub-contraries cannot both be false, though both can be true.
★Contrary opposition instead holds between two universals.
★So the answer is sub-contrary.
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