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Given the Argument: a ⊃ ∼B / B ∨ a

Question 314

Multiple Choice

Given the argument: A ⊃ ∼B / B ∨ A // ∼B ≡ A.
This argument is:

A) Invalid; fails in 4th line.
B) Invalid; fails in 2nd line.
C) Valid.
D) Invalid; fails in 1st line.
E) Invalid; fails in 3rd line.

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