(J ? ?M) • (?A ? R) $\frac { \mathrm { M } V \sim \mathrm { R } } { \sim \mathrm { J } \vee \mathrm { A } }$
A) DD-valid.
B) Invalid.
C) CD-valid.
D) MT-valid.
E) CD-invalid.

Question

Quizplus · Accepted Answer

The argument is DD-valid because the first premise is a universal affirmative proposition (A) and the second premise is a universal negative proposition (E). The conclusion is also a universal negative proposition (E).

(J ? ?M) • (?A ? R) MV∼R∼J∨A\frac { \mathrm { M } V \sim \mathrm { R } } { \sim \mathrm { J } \vee \mathrm { A } }∼J∨AMV∼R​

(J ? ?M) • (?A ? R) $\frac { \mathrm { M } V \sim \mathrm { R } } { \sim \mathrm { J } \vee \mathrm { A } }$