LG Game 3 Question 17 Explanation, by LSATHacks
Everyone hates rule substitution questions, but I actually think they can be solved quite easily. The trick is to look at all the factors which affect the variable in question. That lets you find the full effects of all the rule affecting that variable. This description of the full effects of the rule lets you replace the rule.
This question talks about K. We saw in the setup that K can’t be treasurer or councillor:
- Only F or H can be treasurer (rule 2)
- Rule 4 directly restricts K from being councillor
So, if K is in, they must be mayor. That’s the full effect of all rules affecting K. And, it’s in the answers: E is CORRECT!
That’s really all there is to rule substitution! They can be prephrased.
If you were stuck on eliminating other answers, there are shortcuts for that too. Since we’re just trying to replace the setup, that means the alternate rule must:
- Allow everything normally allowed
- Forbid everything normally forbidden (including mimicking the rule being replaced)
Anything that contradicts the normal setup is wrong.
- A is wrong because L can normally be mayor.
- B is wrong because it still allows K to be councillor! You could have J and K, for example.
- C contradicts the setup. Normally K can be in if F is out. Further, it also lets K be councillor if F is in!
- D is true in the ordinary setup, but it doesn’t get the effect we want. K could be councillor with this rule, if H wasn’t!Game 4 – Corporation Bonds
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