by tommywallach Mon Aug 06, 2012 2:55 pm
5. (D)
Question Type: Unconditional
We have returned to the world of unconditional questions. With no new constraints, we have only our old diagram to go by. The question is asking us which answer could never be true, which means we’ll have to try and find a situation where each answer choice COULD be true in order to eliminate it.
(A) Well we already know that Gus has to be with Lisa, so this would require Lisa to be driving. Is that possible? Yes! Faith could drive the other car, bringing Hannah, Juan, and Kenneth with her.
(B) We know that either Faith or Gus has to drive Hannah (Constraint 1). If Gus drives her, he also has to bring Lisa (Constraint 3), which is no good. But if Faith drives her, everything is fine. Kenneth could drive the other car (to meet Constraint 2), and bring the other three workers with him.
(C) We know that either Faith or Kenneth has to drive Juan (Constraint 2). If Faith drives Juan, Gus could take all the other workers in his car. If Kenneth drives Juan, Faith could take all the other workers in her car. Either way, we can get Juan alone with his driver.
(D) If Kenneth doesn’t drive, he must be driven by someone, and we already know that neither Hannah nor Juan can drive. If Kenneth is driven by Faith, Juan must come along (by Constraint 2), which is no good. If he’s driven by Gus, Lisa hs to come along (by Constraint 3), which is no good. Finally, if he’s driven by Lisa, Gus has to come along (also by Constraint 3). There’s no way for Kenneth to be alone with his driver.
(E) We already know this is possible from (A).