| P | Q | P  ~P | Q  ~Q | (P ~P)  (Q ~Q) |
|---|---|---|---|---|
| T | T | F | T | T |
| T | F | F | T | T |
| F | T | F | T | T |
| F | F | F | T | T |
~P) (Q ~Q) and determine whether it is a tautology, a contradiction or neither. Explain your conclusion.
| P | Q | P ~P | Q ~Q | (P ~P) (Q ~Q) |
|---|---|---|---|---|
| T | T | F | T | T |
| T | F | F | T | T |
| F | T | F | T | T |
| F | F | F | T | T |