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Propositional Logic: Logical Arguments and Validity
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Which of the following is a logically valid argument form?
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A
If P, then Q. Not Q. Therefore, not P.
💡 Explanation:
This argument form is known as modus tollens and is logically valid because if the antecedent (P) is true and the consequent (Q) is false, then the negation of the antecedent (not P) must be true.