Determine Whether the Argument Is Valid or Invalid $\lor$

question 182

Multiple Choice

determine whether the argument is valid or invalid. If it is invalid, select a counterexample.
-1. ∼(R $\lor$ S)
2) ∼R ⊃ (∼T ⊃ X)
3) T ≡ X / T

• A) Valid
• B) Invalid. Counterexample when R and S are true and T and X are false
• C) Invalid. Counterexample when R is true and S, T, and X are false
• D) Invalid. Counterexample when S is true and R, T, and X are false
• E) Invalid. Counterexample when R, S, T, and X are false

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