Paper 1 · Logical Reasoning
If one of two sub-contraries is true, then the other one is
ATrue
BFalse
CDoubtful ✓ Correct
DNeither true nor false
Correct answer: (C) Doubtful — If one sub-contrary is true, the other is doubtful, so that is the answer.
Explanation
★If one sub-contrary is true, the other is doubtful, so that is the answer.
★Sub-contraries can both be true together.
★So the truth of one does not fix the value of the other.
★The other may be either true or false.
★Hence its value remains undetermined, that is doubtful.
★So the answer is doubtful.
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