G ? ?T $\frac { ( \mathrm { G } \supset \sim \mathrm { H } ) \cdot ( \sim \mathrm { T } \supset \mathrm { A } ) } { \sim \mathrm { H } \vee \mathrm { A } }$

question 73

Multiple Choice

G ? ?T $\frac { ( \mathrm { G } \supset \sim \mathrm { H } ) \cdot ( \sim \mathrm { T } \supset \mathrm { A } ) } { \sim \mathrm { H } \vee \mathrm { A } }$

• A) MP-valid.
• B) CD-valid.
• C) DD-valid.
• D) Invalid.
• E) DD-invalid.

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