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Determine Whether the Given Argument Is Valid or Invalid

Question 161

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. (∃x)(Jx • ∼Kx) ⊃ (∃x)(Lx • Mx)
2. (∃x)(Jx • Lx)
3. ∼(∃x)(Jx • Kx) / ∼(∀x)(Lx ⊃ ∼Mx)

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