Logical ReasoningDifficulty: Hard

PT132 S2 Q19 Explanation

In West Calverton, most

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsMust be True

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Stimulus

In West Calverton, most pet stores sell exotic birds, and most of those that sell exotic birds also sell tropical fish. However, any pet store there that sells tropical fish but not exotic birds does pet stores in West Calverton sell gerbils.

What this question is testing

Must be True

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
19.

If the statements above are true, which one of the following must

Answer choices

  1. Out of Scope4% picked this

    Most pet stores in West Calverton that are not independently owned do not

    The statements do not discuss pet stores that are not independently owned.

  2. Negation17% picked this

    No pet stores in West Calverton that sell tropical fish and exotic

    This negates the third PS + STF + SEB → ~SG statement.

  3. Unsupported Relationship8% picked this

    Some pet stores in West Calverton that sell gerbils also sell

    The third statement indicates SG ↢some↣ SEB that some pet stores in West Calverton that sell gerbils do not sell exotic birds, but that does not mean that some pet stores that sell gerbils do sell exotic birds.

  4. Correct60% picked this

    No independently owned pet store in West Calverton sells tropical fish but

    Why this is right

    This follows from IO + PS → ~(STF + SEB) the third and fourth statements.

    Skill tested: Must be True · how this choice captures the argument's function is the move to repeat next time.

  5. Unsupported Relationship11% picked this

    Any independently owned pet store in West Calverton that does not sell tropical fish

    (E) is talking about indie stores that don't sell fish. Since they're indie stores, we know they won't sell gerbils (indie --> ~gerbil). But we don't learn anything by knowing it's a store that doesn't sell tropical fish. We don't have any rule for stores that DON'T sell tropical fish. So all we know about the stores (E) is talking about is that they don't sell gerbils. We don't know whether or not they sell exotic birds.

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