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