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Given the Argument: S ⊃ (K ∨ ∼ S)

Question 347

Multiple Choice

Given the argument: S ⊃ (K ∨ ∼ S) / K ⊃ S // S ≡ K
This argument is:

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

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