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.

Question

Quizplus · Accepted Answer

The argument is invalid because even though the premises are logically connected, they do not logically lead to the conclusion of R ≡ N. In fact, this conclusion contradicts one of the premises (N ⊃ R) and therefore cannot be logically derived from the premises.

Given the Argument: R ⊃ D / D ⊃ (N