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Given the Argument: N ≡ D / D ⊃ ∼

Question 132

Multiple Choice

Given the argument: N ≡ D / D ⊃ ∼ N // ∼ N
This argument is:

A) Invalid; fails in 2^nd line.
B) Invalid; fails in 4^th line.
C) Valid.
D) Invalid; fails in 5^th line.
E) Invalid; fails in 3^rd line.

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