If Salammbo is the fourth piece on the CD, then which one of the following must be true?

on January 6, 2021

why C over E??

This was hard for me to decide because they both seem like they need to be true....because of the rules and setup with S on 4 (V naturally is 5), this forces T to be before R +S but this also forces W to be before R +T. So, i'm just confused on how to pick the right answer since they both seem like they need to be true. How can you decide which is better?

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Shunhe on January 9, 2021

Hi @teresao,

Thanks for the question! So let’s say we put S in fourth. Well, we know S is before V from rule 1, so V has to go last, in the fifth spot.
?Now look at rule 2, which says that T is either before both R and S, or after both. But we know that T isn’t after S. So T has to be before both R and S. That’s exactly what (C) says, which makes it the correct answer.

(E), on the other hand, doesn’t have to be true. Consider the following example:


S is before V. T is before R and S. And W is later than R and T. None of the rules are violated, so this is a valid setup, with W after T. So (E) could be false and is wrong.

Hope this helps! Feel free to ask any other questions that you might have.