(H ∨ ∼S) • (G ∨ ∼A)
A) MP-valid.
B) CD-valid.
C) DD-valid.
D) CD-invalid.
E) Invalid

Name: (H ∨ ∼S) • (G ∨ ∼A) A) MP-valid. B) CD-valid. C) DD-valid. D) CD-invalid. E) Invalid
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Question

(H ∨ ∼S) • (G ∨ ∼A) 
A) MP-valid. 
B) CD-valid. 
C) DD-valid. 
D) CD-invalid. 
E) Invalid

Quizplus · Accepted Answer

The given formula cannot be classified as any of the valid forms of deduction, namely MP-valid, CD-valid, or DD-valid. It is also not clearly invalid, hence E is the answer.