LG Game 2 Question 7 Explanation, by LSATHacks
Rule 5 says that X and U must be together. So, if X is in slot 1, then U must be in slot two:
This means T _ _ W can only start in 3 or 4. When a question gives you only two possibilities, it’s good to draw a scenario for both. One with T_ _W starting in 3, and one with them starting in 4:
Scenario 1
Scenario 2
I’ve filled in the remaining variables in each diagram. The space of two will be filled with R and one of S/Z. The other of S/Z will go in the single space. (This is because S and Z can’t go beside each other.)
You might think “I have no time to draw that!”. I suggest practicing doing it quickly. You can leave off certain details. For example, I don’t draw numbers on my local diagrams, and I don’t draw the “not T” under the diagram.
I just timed myself, and it took me 25 seconds to draw both diagrams. But then it only took me 13 seconds to look through the answers, conclusively eliminate the wrong ones and definitively prove the right one.
If you never practice a skill, of course you’ll be slow at it. But if, when you review, you practice quickly splitting scenarios, you will get fast at them. And pretty much every time you can split a diagram two ways, you’ll find it solves the question, so you can draw it without thinking.
Of course, it may not occur to you to split, which is not a problem – you can also solve this question just by doing the first XU drawing. You don’t have to find every efficiency on test day to do a game well. But practicing efficiencies on review makes you more likely to spot at least some of them in timed conditions.
Anyway, E is CORRECT. Z can go third in the second diagram above. All of the other answers contradict the diagrams.
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