Logical ReasoningDifficulty: Easy

PT117 S3 Q22 Explanation

Most people who shop for

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

TopicsParallel Flaw

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Stimulus

Most people who shop for groceries no more than three times a month buy prepared frozen dinners regularly. In Hallstown most people shop for groceries no more than three times a buy prepared frozen dinners regularly.

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
22.

Which one of the following arguments has a flawed pattern of reasoning most like the flawed reasoning in

Answer choices

  1. Weak Premise Match1% picked this

    It is clear that most drivers in West Ansland are safe drivers since there are very few driving accidents in West Ansland and

    There's only one Most premise. The other premise is just saying "there are very few driving accidents in West Ansland". We can't repurpose that into a Most claim. (By contrast, if it had said "few of West Ansland's accidents occur in the suburbs", we could rephrase that as "Most of West Ansland's accidents do not occur in the suburbs".)

  2. Bad Premise / Conclusion Match2% picked this

    It is clear that John cannot drive, since he does not own a car and no one in his family who does

    None of these claims are Most claims. We want all of them to be.

  3. Bad Premise Match3% picked this

    It is clear that Fernando’s friends usually drive to school, since all of his friends can drive and all of

    There is a Most conclusion, "most of F's friends drive to school", but the two premises aren't Most claims.

  4. Correct86% picked this

    It is clear that most people in Highland County drive sedans, since most people who commute to work drive sedans and most people

    Why this is right

    This ends up being the only answer choice with 3 Most claims, so that's a friendly shortcut they provided for us. Do the two Most premises try to chain together with an overlapping ingredient? Most A's are B + Most B's are C --------------------------- Most A's are C Yes. We can set it up the same way. Most HC's are commute + Most commute are DS ------------------------------------- Most HC's are DS If it's hard to understand why this is flawed, consider some numbers. Suppose there are 100 drivers in HC. 60% of HC's commute. 60 commuters 6/10 of 100 60% of commuters drive sedans. 36 sedans 6/10 of 60 So 36 out of 100 people drive sedans, and yet the conclusion is saying most people drive sedans.

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

  5. Weak Premise Match Valid Logic7% picked this

    It is clear that most of Janine’s friends are good drivers, since she accepts rides only from good drivers and she accepts

    Only one of the two premises is a Most claim. Also, if we happened to not notice that and bothered reading the whole argument, it turns out this is actually valid logic.

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