LG Game 2 Question 10 Explanation, by LSATHacks
I found this question hard. I eventually figured out what I was missing: I had forgotten that at least four employees must be selected.
This question places Y out. That also forces W out. You can draw this as an in-out diagram, it may help you to keep track:
We need at least four variables in. I’ve drawn that as a reminder in this diagram, but I won’t always repeat it.
So, Y and W are out. Since we need at least four employees in, we can have, at most, two more employees in the out group.
The answers ask who can’t be placed in. The right answer will be an employee that forces more than two other employees out if they are in.
That’s M. Refer to the diagram, look at “M in”, and you’ll see that O, P and S must be out. That’s five people out total, which is too many:
E is CORRECT.
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For this question, I found the answer from using the answer to question 8. The answer has O, P, T, and Z on the team. So, Y is not on the team and yet these four people are. That lead me to eliminate answer choices A, B, C, and D, automatically giving me the answer of E. It took me 5 seconds to find the answer.
I was just wondering if this was an acceptable way to do a problem like this, given the right info in another question’s answer?
Yes, you could definitely use #8 to solve this question very quickly.
A word of caution about using your work from other questions, though: if you didn’t get the correct answer on the earlier question, there’s a very good chance that you won’t get the correct answer on the current question either. Since #8 is a relatively easy list question if you’ve mastered in/out games, then there’s less of a risk. But, keep in mind that if you’ve made just one mistake in your reading of the rules, then you could jeopardize your accuracy on both questions. That’s why I’d likely use the method in the explanation to solve this game, even if I had noticed what you’d noticed while doing the game myself. That way, I’d have one pretty good test of whether I’d written out my rules correctly–I usually check to make sure whether all the other answers are definitely incorrect when I’m doing the earlier questions of the game. I can then feel more confident in my answers to later questions, and reduce the chance of making a careless error in my initial setup and not catching it early.