Question
~ P → ~ Q
| Column $\rightarrow$ | 1 | 2 | 3 | 4 | 5 |
| Row $\downarrow$ | P | Q | ~P | ~ Q | ~P $\rightarrow$ ~ Q |
| 1 | T | T | F | F | T |
| 2 | T | F | F | T | T |
| 3 | F | T | T | F | F |
| 4 | F | F | T | T | T |
| 1(~) | 2 (~) | 3, 4 ($\rightarrow$) | |||
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| $(P \rightarrow Q)\ \&\ (R \rightarrow S)$ |
| $(Q \rightarrow T)\ \&\ (S \rightarrow P)$ |
| $\sim T$ |
| $\therefore \sim R\ \&\ \sim T$ |
| $(P\ \&\ Q) \rightarrow S$ |
| $S \rightarrow ( \sim L \rightarrow \sim N)$ |
| $\sim L\ \&\ \sim N$ |
| $P\ \&\ Q$ |
| $\therefore\sim N\ v\ F$ |