(L ? ?C) • (D ? ?Q) $\frac { \sim \mathrm { L } \vee \sim \mathrm { D } } { \mathrm { C } \vee \mathrm { Q } }$
A) DA-invalid.
B) CD-valid.
C) Invalid.
D) DD-valid.
E) CD-invalid.

Question

Quizplus · Accepted Answer

The argument is invalid because the premises do not logically lead to the conclusion. The negation of L or D does not necessarily imply C or Q.

(L ? ?C) • (D ? ?Q) ∼L∨∼DC∨Q\frac { \sim \mathrm { L } \vee \sim \mathrm { D } } { \mathrm { C } \vee \mathrm { Q } }C∨Q∼L∨∼D​

(L ? ?C) • (D ? ?Q) $\frac { \sim \mathrm { L } \vee \sim \mathrm { D } } { \mathrm { C } \vee \mathrm { Q } }$