Rule substitution questions are harder than other questions, but they’re not as hard as you think. The key is to eliminate silly answers. Remember, four of the answers are wrong. You don’t have to give them any respect. They’re mostly stupid answers. Your goal should be to prove they’re stupid.
An answer can be wrong for two reasons on a rule substitution question:
- It allows something not allowed under the normal rules.
- It restricts something allowed under the normal rules.
I go through each answer and try to disprove it, applying those tests. If an answer seems plausible and doesn’t violate either test, then I keep it as a contender. Once I’ve eliminated some answers, I can test the remaining answers more thoroughly.
A isn’t restrictive enough. It only blocks R from being fourth, and therefore it allows this scenario:
(It’s wrong, because R can’t be fifth normally.)
B seems plausible. Let’s skip it.
C describes something that has to be true (V is always 3rd or 4th), but that’s not what we’re looking for. We want a rule that matches the effects of the original rule, but this new rule allows this possibility:
V is third (like the rule says), but R is fifth, which isn’t allowed.
D isn’t true. In the 1st scenario, Q doesn’t have to be beside R: Q can be fourth. So this answers prevents possibilities that are normally allowed.
E allows possibilities that normally aren’t allowed, like this:
T is shown fifth, so the rule in E is obeyed. But R is no longer 1st or 2nd.
So let’s look at B again. It says that R must be earlier than V. If you look over all four scenarios, you’ll see that V can only be 3rd or 4th.
If V is 3rd, then R must be 1st or 2nd. This obeys the old rule.
If V is fourth, the Q must be 3rd, since Q or V always has to be third (rule 3). So this means that once again R must be 1st or 2nd to be earlier than V.
Therefore, the rule is replaced either way. B is CORRECT.
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