This question asks who can be third. To answer this question, you should look at third and think about what we already know about it:
We know two things:
- M must be third.
- L must go with M or K, but not both of them.
That means, therefore, that K can’t go third. So, this question was already solved from the setup.
D is CORRECT.
Sometimes, of course, you won’t make that deduction in the setup. Here’s another way to solve it: think about whether placing a variable third makes it easier or harder to fulfill the rules.
For example, O and P can’t go first. So, placing them third fulfills that rule and therefore makes it easier to solve the game. Therefore, it is likely possible that O and P can go third.
Rule 1 places M third, so that also can’t be the answer. And we know from past questions that L can go third (since L goes with either M or L).
That leaves only J and K as possible answers. And J and K are identical, except that K also has the additional rule that it might have to go with L. This makes J easier to place than K, and therefore J is unlikely to be the answer.
So this process also leads us to K. This “easier/harder” framework comes in handy quite a bit in choosing between answers on “could be true” and “cannot be true” questions.
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