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Course: LSAT (DEPRECATED) > Unit 1

Lesson 5: Analytical Reasoning – Worked examples

Mixed setup | Given info–must be true | Worked example

Watch a demonstration of one way to approach a "Given info: must be true" question on a mixed setup from the Analytical Reasoning section of the LSAT.

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Video transcript

- [Instructor] Before you watch this video, make sure to watch the overview video for this same set up because that's where we notated the rules and made the deductions that you're going to see me using here. This question asks which one of the following must be true of one of the program segments? So, we need to identify what must be true given the set up rules. Since we are not given any further context to work with, we're going to have to evaluate each of the choices in turn against what we know to be true. (A) is that Fallon is the sole politician interviewed Does this have to be true? Well, if it's true in both scenarios, then it must be true. So let's take a look. In scenario one, we deduced in our set up that Fallon has to be in segment two and that Fallon is alone. In scenario two, we know that Fallon can't be first and has to be second or third and both segment two and segment three feature only one politician. So this choice must be true. Fallon will always be alone in an interview segment. On test day, you can either move on at this point or glance over the rest of the choices in order to confirm your answer. It largely depends on you and how your timing is going and your confidence. So let's take a look at the rest of the choices. (B) says that Greer is the sole politician interviewed. Well, this could be false. We see in scenario one that Greer could be paired with Hernandez in segment one. So this doesn't have to be true. (C) Greer and exactly one of the other politicians are interviewed. No, this could be false as well, because in scenario one Greer could be alone in segment four. That would leave Lewis in segment one which is just fine. (D) Hernandez and exactly one of the other politicians are interviewed. Well, this is true in scenario one but it could be false in scenario two. Hernandez could be interviewed in segment two which would put Fallon in segment three and leave Greer and Lewis in segment one. Since this is acceptable, then it doesn't have to be true that Hernandez is paired with someone else. (E) states that Lewis and exactly one of the other politicians are interviewed. And this could also be false, because of scenario one Lewis could be alone in segment four. So (A) is our answer, because it must be true, while all of the other choices we looked at could be false.