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Determine Whether the Given Argument Is Valid or Invalid ∨ \lor

Question 114

Essay

determine whether the given argument is valid or invalid. If it is valid, provide a derivation of the conclusion from the premises. If it is invalid, provide a counterexample.
-1. ∼A ∨ \lor B
2. ∼B ⊃ (C ⊃ D)
3. C ≡ ∼D / ∼C

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