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∼D ⊃ ∼C

Question 120

Multiple Choice

∼D ⊃ ∼C ∼D ⊃ ∼C A) MP-valid. B) DS-valid. C) Invalid. D) CD-valid. E) HS-valid.


A) MP-valid.
B) DS-valid.
C) Invalid.
D) CD-valid.
E) HS-valid.

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