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Logical Reasoning · Strengthen

PrepTest 157 · Section 2 · Question 13

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

Step 1 · Pre-Question Guidance · read this first

Question type
Strengthen
The one idea it tests
When evidence is offered as a sign of one activity, rule out the other jobs that same evidence could have done.
The basic logic
Objects found together are treated as proof of a certain activity. But those objects could have had other uses. The best strengthener blocks those other uses, so the evidence points only toward the conclusion.
Tiny words that decide it
  • “since”
  • “entirely”
  • “disproves”

Playground logic

Lulu's patty is a jump rope found beside worn chalk squares from before the new kids moved in. Her top bun says the old crew played rope games, not just sat around. The strengthener plugs the escape route: the rope was not used for tying bikes or hauling stuff.

Step 2 · The kid story

The Jump Rope in the Old Lot

Everyone on Maple Street said the older crew, the ones who lived there before the new families arrived, just sat on the curb and traded cards. Never played a single game. Then Lulu, digging behind the shed in the old lot, found a frayed jump rope next to faded chalk squares. "Aha!" she said. "They played rope games!" Marcus wasn't sure. "Maybe they used that rope to tie their bikes to the fence. Or to drag their card boxes around." Priya nodded. "That's the weak spot. If the rope did some other job, it proves nothing about games." Lulu dug deeper and found Aunt Rosa's old notebook: Bikes were locked with chains, and card boxes had handles. Lulu grinned. "Now the rope has no other job left. It was for jumping."

Step 3 · Try the model question

People believe the older crew on Maple Street never played games. But Lulu found an old jump rope next to worn chalk squares from before the new families arrived. So the belief is wrong: the older crew played rope games.

Suppose each choice were true. Which one gives Lulu's argument the biggest boost?

Choices

Step 4 · The courtroom tale

The Ladder by the Window

The prosecutor said a ladder found under a window proved the defendant climbed in. Mr. Whitfield, for the defense, stood up. "Your Honor, ladders do many things. My client paints houses. He cleans gutters." The prosecutor called a new witness, the homeowner. "The house was painted ten years ago. The gutters were cleaned from the roof hatch. Nobody needed a ladder there for any chore." The judge looked at Mr. Whitfield. "Counselor, the other jobs for that ladder seem to have vanished." Mr. Whitfield sat down slowly. "Then I suppose the ladder now points one direction, Your Honor." The jury leaned in.

Step 5 · Work the real question

Open PrepTest 157, Section 2, Question 13 in your official copy from LSAC (for example in LawHub) and read it there.

Your answer

How to apply it

Spot the evidence: things found together, offered as a sign of one activity. Ask what else those things could have been used for. Each other use is a way out for the argument. The best strengthener closes those exits by saying the objects were not used for the other purposes. Be wary of answers that talk about a different time, a different group, or habits that tell us nothing about how these objects were used.