Logical ReasoningDifficulty: Easy

PT123 S2 Q2 Explanation

All Labrador retrievers bark

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

TopicsParallel Flaw

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Stimulus

All Labrador retrievers bark a great deal. All Saint Bernards bark infrequently. Each of Rosa’s dogs is a cross between a Labrador retriever and Rosa’s dogs are moderate barkers.

What this question is testing

Parallel Flaw

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
2.

Which one of the following uses flawed reasoning that most closely resembles the flawed reasoning used in

Answer choices

  1. Wrong Premise3% picked this

    All students who study diligently make good grades. But some students who do not study diligently also make good grades. Jane studies somewhat diligently.

    The two groups in this argument do not have different characteristics (barks a great deal and barks infrequently) but rather the same characteristic (good grades). And the first two premises are a mix of ALL and SOME, whereas the original was ALL and ALL.

  2. Correct92% picked this

    All type A chemicals are extremely toxic to human beings. All type B chemicals are nontoxic to human beings. This household cleaner is a

    Why this is right

    This contains the relationship that one group (this household cleaner) is a mix of two other groups (type A and type B chemicals), so a characteristic that is different in the two other groups is mixed in the group that is itself a mixture.

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

  3. Wrong Validity2% picked this

    All students at Hanson School live in Green County. All students at Edwards School live in Winn County. Members of the Perry family attend

    This argument is valid, while the one in the stimulus is invalid.

  4. Wrong Validity1% picked this

    All transcriptionists know shorthand. All engineers know calculus. Bob has worked both as a transcriptionist and as an engineer. Therefore, Bob

    This argument is valid, while the one in the stimulus is invalid.

  5. Wrong Flaw1% picked this

    All of Kenisha’s dresses are very well made. All of Connie’s dresses are very badly made. Half of the dresses in this closet are

    The flaw in this argument is reversed logic. The first two premises were promising, but then the argument would have to go onto say something like: Prem 3: This dress was made by Kenisha and Connie. Conc: Thus, this dress will be moderately well made.

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