The correct answer is C.See the question again >
Exactly seven toy-truck models—F, G, H, J, K,M, and S—are assembled on seven assembly lines, exactly one model to a line. The seven lines are arranged side by side and numbered consecutively 1 through 7. Assignment of models to lines must meet the following conditions:
F is assembled on a lower-numbered line than J.
M is assembled on the line numbered one lower than the line on which G is assembled.
H is assembled on line 1 or else line 7.
S is assembled on line 4.
PrepTest 30, Section 1, Game 1, Question 19:
If K is assembled on line 5, which one of the following is a pair of models that could be assembled, not necessarily in the order given, on lines whose numbers are consecutive to each other?
Watch star instructor Jeff Boudreau teach you how to tackle the question – or read the explanation below.
PrepTest 30, Section 1, Game 1, Question 19
This may seem like a tough game at first, but a sequencing logic game is one of the most frequently tested types of games on the LSAT—and one you will master with practice and your Kaplan methods. Let's dig deep.
The Action: Seven toy-truck models are assembled on seven different assembly lines.
We need to find the order of the assembly lines—we don't care about what stage of assemblage each truck is in. As usual, the Key Issues in this straightforward Sequencing game are:
1) What is the order of the toy-truck assembly lines?
2) Which toy-truck assembly lines could, must, and cannot be consecutive with which other assembly lines?
The Initial Setup: Seven dashes representing the assembly lines is the standard way to go here. We can fill the toy-trucks into the spaces as we go along. Let's, as usual, also make a list of the seven entities.
1) F's assembly line is before J's line. "F. . .J" is the standard Kaplan symbol for rules of this type.
2) M's line is numbered one less than G's line—very simply, that's "MG."
3) H must go on one of two lines, 1 or 7. We can build this rule right into the sketch by writing an "H" with arrows pointing to assembly lines 1 and 7.
4) Here's a concrete rule. We can place S on line 4. We can also cross S off our list of entities.
Key Deductions: There are no big deductions to be made in Step 4 of the Kaplan Method. This game, though not tough by LSAT Logic Game standards, remains wide open.
The Final Visualization:
The Big Picture:
• You won't always be able to find large deductions in the setup—they're not always there. If you can't make any deductions up front, then at least make sure you understand all of the rules before heading into the questions.
• We advise you to scope out and incorporate the most concrete rules first, and here that's Rule 3. Doing so gives you an opportunity to build the other rules around something that is set. Here, the "S" in the fourth slot doesn't help us that much, but the general strategy remains sound: While you'll never waste time handling the most concrete rules first (you have to deal with them sometime), in many cases you'll find that you save time by doing so.
• Straight Sequencing games have for many years been commonplace on the LSAT, and are often a good place to start a Logic Games section. That this game has seven questions makes it all the more attractive as a place to begin.
• Incorporate the rules directly into your diagram. Instead of writing "S in 4" or "H in 1 or 7," build these rules right into your sketch.
• Not all entities are created equal, and it behooves you to notice the role and relative importance of each in the game. Here, in order of "restrictedness," S is permanently fixed, H is limited to two spots, M and G form a bloc, F and J are related, and K's placement is totally open— our "free agent."
The new piece of information, that K is in 5, does not allow us to deduce anything further. Again, we must move to the choices, this time in search of models that could be assembled next to each other.
(A) lists G and H on consecutive lines, but that's impossible. The placement of H is limited to spaces 1 or 7 (Rule 3). If H is in 1, then G can't be in 2, because M must immediately precede G (Rule 2). And if H is in 7, then G can't be in 6, because we need two spaces for MG, and K is in 5.
(B) has G and J. Again, we are restricted by Rule 2, which has M right before G. So, if G and J are to be consecutive, then G must come right before J, and not vice versa. Therefore, to test choice (B), we'll try to place the bloc of three trucks, "MGJ." M, G, and J cannot be 1, 2, and 3, respectively, because that would violate Rule 1. And there's no room for this bloc of three after S and K. Since we can't place "MGJ," (B) is out.
(C) What about H and J? H is limited to spaces 1 or 7 by Rule 3. With H in 1, we can't have J in 2 (Rule 1). But with H in 7, J can be in space 6. Here's one way:
At this point in an actual Logic Game, after finding the right answer, we again recommend that you move on to the next question. For our purposes, however, it is useful to explain why (D) and (E) are incorrect.
(D) For J and M to be consecutive, J must precede M (Rule 2). So for the toy trucks in (D) to be consecutive, we'll need to fit "JMG." That bloc of three cannot go in 1, 2, 3, because F must come before J (Rule 1). Since there are no other three consecutive open spaces, (D) must be wrong.
(E) With S firmly placed in space 4 (Rule 4), and K in space 5, there is no way for S and M to be next to each other, because placing M in space 3 would violate Rule 2.
At Kaplan, we'll teach you how to set up each and every type of Logic Game you could possibly face on Test Day, and delve deep into the types of deductions frequently embedded in their structure. The result? You'll leave confident in your approach to Logic Games on Test Day.
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