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

Question 181

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 ⊃ (B ∨ \lor ∼C)
2. A ≡ (B ∨ \lor C) / ∼B ⊃ ∼A

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