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

Question

Quizplus · Accepted Answer

The Answer of (R ? ?T) • (D ? T) $\frac { \sim \mathrm { T } \vee \mathrm { T } } { \sim \mathrm { R } \vee \sim \mathrm { D } }$
A) MT-valid.
B) CD-invalid.
C) CD-valid.
D) HS-valid.
E) DD-valid.

(R ? ?T) • (D ? T) ∼T∨T∼R∨∼D\frac { \sim \mathrm { T } \vee \mathrm { T } } { \sim \mathrm { R } \vee \sim \mathrm { D } }∼R∨∼D∼T∨T​

(R ? ?T) • (D ? T) $\frac { \sim \mathrm { T } \vee \mathrm { T } } { \sim \mathrm { R } \vee \sim \mathrm { D } }$