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Given the Argument: R ⊃ D / D ⊃ (N

Question 20

Multiple Choice

Given the argument: R ⊃ D / D ⊃ (N ∨ S) / S ⊃ (P ∨ N) / N ⊃ R // R ≡ N
This argument is:

A) Uncogent.
B) Invalid.
C) Sound.
D) Cogent.
E) Valid.

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