LG Game 1 Question 4 Explanation, by LSATHacks
This question asks who can be shipped second. To answer that, you should look at which variables don’t have any lines to the left of them. Then trace forward one line. Those are the variables that can go second. Like this:
On the diagram, if something has zero people in front of it, I marked a 0, and if it has one person in front, I marked a 1. Either group can go second.
You should learn to see sequencing diagrams this way. how many things are in front of a variable: 0, 1 or more? It determines where they can go.
(Something like S can easily go 2nd, as well, you just put T in front of S).
So, B is CORRECT.
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