alleryStart learning →If the alarm rings the guard wakes; the guard did not wake. What follows?
AThe alarm did not ring
BNothing can be concluded
CThe guard slept earlier on
DThe alarm must have rung
Answer & Solution
Correct answer: A. The alarm did not ring
Modus tollens denies the consequent, so the antecedent must also be false and the alarm did not ring.
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