Paper 1 · Logical Reasoning
If one of two contradictories is true, then the other must be
ATrue
BFalse ✓ Correct
CDoubtful
DNeither true nor false
Correct answer: (B) False — If one contradictory is true, the other is false, so that is the answer.
Explanation
★If one contradictory is true, the other is false, so that is the answer.
★Contradictories cannot both be true and cannot both be false.
★Exactly one is true and the other false.
★So the truth of one entails the falsity of the other.
★This mutual exclusion is the mark of contradiction.
★So the answer is false.
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