Logical Reasoning · Paradox (EXCEPT)

PrepTest 110 · Section 3 · Question 2

Phase 1 (your first ~400 questions): read the guidance, then answer. No clock.

Step 1 · Pre-Question Guidance · read this first

Question type

Paradox / Explain the Practice (EXCEPT)

The one idea it tests

Four choices give a good reason for a practice; the odd one out gives no reason, often because it runs the logic in the wrong direction.

The basic logic

State the practice as a goal and a method: people study the easier thing to learn about the harder thing. A good explanation shows why the method helps reach the goal. The answer is the choice that fails the Handshake Test, often by flipping the arrow so the goal helps the method instead.

Tiny words that decide it

“EXCEPT”
“explain”
“which direction”

Playground logic

Lulu studies a toy railroad to understand the real city bus system. Four reasons explain why the toy helps her learn about the buses. The trap is a reason that points the other way: knowing the buses helps her understand the toy. That is a Backwards Arrow, and it explains nothing about her habit.

Step 2 · The kid story

Lulu's Tabletop Bus Lab

Lulu wanted to understand why the city bus was always late on Tuesdays. So she built a toy railroad in her bedroom, with tiny stops for the library, the bakery and Grandpa's house. Every afternoon she ran it, timing each train with a stopwatch. Tommy peeked in. "Why are you playing with trains if you care about buses?" Lulu tapped her clipboard. "The toy runs the same routes every time, so I can repeat a Tuesday ten times in one hour." Priya added, "And she can stop it and look, which you cannot do with a real bus." Marcus said, "I bet knowing the bus system helps her build the toy." Priya shook her head. "Maybe. But that is backwards. It does not explain why she studies the toy to learn about the bus."

Step 3 · Try the model question

To understand why the city bus system runs late, Lulu studies a toy railroad she built in her room.

Each choice below, if true, helps explain Lulu's approach EXCEPT:

Step 4 · The courtroom tale

The Case of the Miniature Mall

A city sued an architect for wasting money on a tabletop model of a new shopping mall. "Why spend a cent on a toy?" the city's lawyer asked. Mr. Whitfield rose. "Your Honor, the model let my client test fire exits a hundred times. It cost less than one real drill. And she could freeze it and look inside." The city's lawyer smirked. "Well, understanding the real mall helped her build the model!" Mr. Whitfield nodded politely. "Perhaps. But that explains why the model is accurate, not why anyone would study a model to learn about the mall. Wrong direction." The judge tapped her gavel. "The arrow points the wrong way, counsel. Claim denied."

Step 5 · Work the real question

Open PrepTest 110, Section 3, Question 2 in your official copy from LSAC (for example in LawHub) and read it there.

Your answer

How to apply it

First write the practice as a method and a goal: study the stand-in to learn about the real target. Remember this is EXCEPT, so four choices will give a reason the stand-in helps with the target. For each choice, ask whether it makes the method sensible. The answer is the one that does not, and a common way to fail is pointing the arrow backward, from target to stand-in. Check direction carefully.