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

Question 125

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. J ∨ \lor (M ∨ \lor L)
2. (∼J ⊃ M) ⊃ K
3. K ⊃ N
4. ∼J • ∼L / N

Correct Answer:

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