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Logical Reasoning · Necessary Assumption

PrepTest 103 · 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
Necessary Assumption
The one idea it tests
A warning label only warns people who actually look at it.
The basic logic
The plan posts a rating so a certain audience is warned. The secret sauce is that the audience will see and notice the rating. Pull the Plank: if they never look, the plan cannot meet its purpose.
Tiny words that decide it
  • “would”
  • “forewarn”
  • “plan”

Playground logic

The cafeteria plans to put pepper stickers next to each dish on the menu board so kids are warned about spicy food. The hidden plank: kids will actually read the board. Pull it out and the plan warns nobody.

Step 2 · The kid story

Pepper Stickers

The cafeteria manager announced a new plan. Each dish on the menu board outside the lunchroom would get pepper stickers: one pepper for mild, four peppers for fire-breathing. "Now nobody gets surprised by spicy food!" she said. Tommy, who had once eaten a four-pepper taco by accident and cried into his milk, cheered. Lulu raised her hand. "Um, does anybody actually look at the menu board? Most kids just run in and grab a tray." The manager paused. Priya added, "Your plan only works if kids read the stickers and notice them. If nobody looks, the peppers are wallpaper." Marcus said, "Maybe we need a sticker warning people to read the stickers." Everyone ignored him.

Step 3 · Try the model question

The cafeteria will put one to four pepper stickers beside each dish on the menu board outside the lunchroom, showing how spicy it is. The manager believes this will warn students about spicy dishes before they choose their lunch.

For the manager's belief to hold, which of these must be taken for granted?

Choices

Step 4 · The courtroom tale

The Case of the Invisible Sign

A trampoline park was sued after a guest bounced into the foam pit and lost a shoe forever. The park's lawyer said, "We posted a sign warning guests about the pit." Mr. Whitfield stood up. "Where was the sign?" "On the back wall, behind the snack machine." "And how many guests looked behind the snack machine?" Silence. Mr. Whitfield turned to the judge. "A sign can only warn people who read it. The park's plan assumed guests would see it. Nothing shows anyone did." The judge sighed. "Next time, counselor, maybe put the sign where the eyes are."

Step 5 · Work the real question

Open PrepTest 103, Section 2, Question 13 in your official copy from LSAC (for example in LawHub) and read it there.

Your answer

How to apply it

Find the plan and its stated goal. Ask: what must happen between posting the information and the goal being met? Usually the audience has to see it and pay attention. Negate each choice; the right one, when flipped, breaks the chain between the plan and the goal. Watch out for choices that demand the plan be the best, talk about duties, or change some other behavior.