Question
Which custom is acceptable for checking the validity of an argument?
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| (1) (A & B) $\rightarrow$ (R v s) | P |
| (2) P v ~(M & N) | P |
| (3) (A & B) v ~ | P |
| (4)(H & J) $\rightarrow$ (M & N) | P |
| (5) ~(R v S) | P/ $\therefore$ (H & J) &~P |
| (6) ~(A & B) 7 | ................ |
| (7) ~ P | ................ |
| (8) ~ (M & N) | ................ |
| (9) ~(H & J) | ................ |
| (10) ~(H & J) &~P | ................ |
| (1) (A v X) &Y | P |
| (2) [(A v X) v T] $\rightarrow$ M | P |
| (3) [(A v X) &M] $\rightarrow$ Z | P/$\therefore$ Z |
| (4) (A v X) | ................ |
| (5) (A v X) v T | ................ |
| (6) M | ................ |
| (7) (A v X) &M | ................ |
| (8) Z | ................ |