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