Determine Whether the Given Argument Is Valid or Invalid

question 272

Multiple Choice

determine whether the given argument is valid or invalid. If it is invalid, select a counterexample.
-1. (∃x) (Jx • ∼Kx) ⊃ (∃x) (Lx • Mx)
2) (∃x) (Jx • Lx)
3) ∼(∃x) (Jx • Kx) / ∼(∀x) (Lx ⊃ Mx)

• A) Valid
• B) Invalid. Counterexample in a domain of 1 member, in which:
• Ja: True Ka: False La: True Ma: True
• C) Invalid. Counterexample in a domain of 1 member, in which:
• Ja: False Ka: False La: True Ma: True
• D) Invalid. Counterexample in a domain of 1 member, in which:
• Ja: True Ka: True La: True Ma: True
• E) Invalid. Counterexample in a domain of 1 member, in which:
• Ja: True Ka: False La: False Ma: False

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