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Determine Whether the Argument Is Valid or Invalid ∨ \lor

Question 295

Multiple Choice

determine whether the argument is valid or invalid. If it is invalid, select a counterexample.
-1. D ⊃ (E • F)
2) D ≡ (E ∨ \lor ∼F) / ∼E ⊃ ∼D


A) Valid
B) Invalid. Counterexample when D, E, and F are false
C) Invalid. Counterexample when F is true and D and E are false
D) Invalid. Counterexample when D, E, and F are true
E) Invalid. Counterexample when D and F are true and E is false

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