Logical ReasoningDifficulty: Hard

PT142 S2 Q23 Explanation

Every brick house on River Street

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

TopicsParallel Flaw

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Stimulus

Every brick house on River Street has a front yard. Most of the houses on River Street that have front yards also have two stories. So most River Street have two stories.

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
23.

Which one of the following is most appropriate as an analogy demonstrating that the reasoning in the argument

Answer choices

  1. Bad Premise Match23% picked this

    By that line of reasoning, we could conclude that most politicians have run for office, since all legislators are politicians and most

    Both premises (the All and the Most) are about "legislators". To mimic the original argument, you'd need one of those to be a subset of the other. f.e. "since all female legislators are politicians and most legislators have run for office".

  2. Bad Premise Match15% picked this

    By that line of reasoning, we could conclude that most public servants are legislators, since most legislators have run for office and most politicians

    We don't really have to read this one, since it has three Most ideas. One of our premises should be an All/No statement.

  3. Bad Conclusion Match4% picked this

    By that line of reasoning, we could conclude that not every public servant has run for office, since every legislator is a public servant,

    Our conclusion should be a Most claim. This one is a "Not all / Some" claim, so we could bail as soon as we see the conclusion. Were you to keep reading, you'd also see that we have an All premise and a Some premise (but that 2nd premise should be a Most claim).

  4. Correct55% picked this

    By that line of reasoning, we could conclude that most legislators have never run for office, since most public servants have never run for

    Why this is right

    This is crazy hard to see, but a good one to guess: All + Most → Most This and (A) are the only two answers that had an All Premise, a Most Premise, and a Most Conclusion. And the All and Most premises do switch from narrower to broader. ALL = legislators Most = public servants (a legislator is just one type of public servant. Police officers, mayors, governors, etc. are other types) Picture the original argument this way: Every [narrower type] has a front yard. Most [broader type] has two stories. Thus, most [narrower type] has two stories. This answer is saying something similar: Every [narrower type] is a public servant. Most [broader type] has not run for office. Thus, most [narrower type] hasn't run for office.

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

  5. Bad Premise Match3% picked this

    By that line of reasoning, we could conclude that most legislators are not public servants, since most public servants have not run for office

    Both Premises are "most" claims, so we don't need to read any further on this one.

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