October 1993 LSAT - Section 3 - Question 11

If M is not selected to attend the retirement dinner, the four people selected to attend must include which one of th...

AndrewArabie October 13, 2022

Lucky Deduction?

One rule can be represented: N-->L Another can be represented: Q-->K Both have a common variable with the "either, but not both" rules above. I combined them to read: N--> not P--> L Q--> not J--> K I got the right answer because I figured it had something to do with this deduction, but I don't know why. I could have ran through several scenarios and did it the long way but I took a chance with this deduction. Did I get lucky or can the answer be derived from this chain alone? If it can, how is that so? I figure if I understood the logic behind this I can use it more often.

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AndrewArabie October 13, 2022

I made the deduction that Q would also be out and that there was only room left for one more to be out so I figured it had something to do with the chain I made above

Emil-Kunkin October 17, 2022

Hi Andrew, good job putting rules together! You absolutely can and should hunt for cases when you can do this, specifically when a variable is mentioned in more than one rule