LSAT PrepTest 79, Section III, Logic Games, Question 19 Explanation

LG Game 4 Question 19 Explanation, by LSATHacks

Mercifully, this is an easy question. The computer which received the first transfer didn’t receive it from any other computer on the network.

This eliminates R, S, Q and P. From our setup diagram, those all received a transfer from another computer on the network:

LSAT Preptest 79, Game 4, Question 19, Diagram 4

(If this didn’t make sense, another way of putting it is that any letter on the right side of a line is disqualified)

That leaves only T or U as possibilities. So, E is CORRECT.

This question also gives us an additional deduction: Either T or U is first. I’m not sure this is that useful though. I tried drawing scenarios with T first or with U first, but there are too many branches.

(I did deduce that if T is first, U comes after S. And if U is first, then T is after S. But, I don’t think this solves any questions. The way I deduced that is simple: none of S, R, Q or P can be after S. So, only T and U are eligible.)

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