Question
How many logical factors are there?
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| (1) (X $\rightarrow$ Y) $\rightarrow$ (A $\rightarrow$ B) | P |
| (2)(A $\rightarrow$ B) $\rightarrow$ R | P |
| (3) [(X $\rightarrow$ Y) $\rightarrow$ R] $\rightarrow$ K=J | P |
| (4) J $\rightarrow$ K | P/ $\therefore$ (J $\rightarrow$ K) & (J & K) |
| (5) ( X $\rightarrow$ Y) $\rightarrow$ R | ................ |
| (6) J | ................ |
| (7)K | ................ |
| (8) J & K | ................ |
| (9) (J $\rightarrow$ K) & (J &K) | ................ |