If one of two contradictories is true, then the other must be

ATrue

BFalse ✓ Correct

CDoubtful

DNeither true nor false

Correct answer: (B) False

Explanation

If one of two contradictories is true, the other must be false.

Contradictories can never share the same truth value.

Exactly one of the pair is true and the other false, always.

If "All S are P" is true, its contradictory "Some S are not P" is false.

This mutual exclusion is the defining law of contradiction.

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