(A ⊃ B) ⊃ {(C ⊃ D) ⊃ [(∼A ⊃

question 175

Multiple Choice

(A ⊃ B) ⊃ {(C ⊃ D) ⊃ [(∼A ⊃ C) ⊃ (∼D ⊃ B) ]}
Which of the following propositions is a proper assumption for conditional proof to prove that the above wff is a logical truth of PL?

• A) (A ⊃ B) ⊃ {(C ⊃ D) ⊃ [(∼A ⊃ C) ⊃ (∼D ⊃ B)]}
• B) (A ⊃ B) ⊃ {(C ⊃ D) ⊃ [(∼A ⊃ C) ⊃ ∼D]
• C) (A ⊃ B) ⊃ {(C ⊃ D) ⊃ (∼A ⊃ C)
• D) (A ⊃ B) ⊃ (C ⊃ D)
• E) A ⊃ B

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