Logical ReasoningDifficulty: Medium

PT125 S2 Q5 Explanation

Byrne: One of our club's bylaws

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

TopicsFlaw

Keep going in LSAT Lab

  • Save & drill this skill build targeted practice sets from questions like this one

  • Video walkthroughs watch every question solved step by step

  • 81 official LSATs as questions, timed sections & full-length tests

Full official LSAT questions are available through LawHub. This page provides LSAT Lab's explanation, strategy, and review tools without republishing the full official question.

Stimulus

Byrne: One of our club's bylaws specifies that any officer who fails to appear on time for any one of the quarterly board meetings, or who misses two of our monthly general meetings, must be suspended. Thibodeaux, an officer, was recently suspended. But Thibodeaux has never missed failed to appear on time for a quarterly board meeting.

What this question is testing

Flaw

Your task

Describe the reasoning error the argument actually commits.

Common trap

Answers that name a real logical flaw the argument doesn't actually make.

Winning move

Articulate the gap in the reasoning yourself, then match it to the choice that describes that 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
5.

The reasoning in Byrne's argument is flawed in that

Answer choices

  1. Out of Scope5% picked this

    fails to consider the possibility that Thibodeaux has arrived late for two or more

    Arriving late for a general monthly meeting is not discussed in the club’s bylaw.

  2. Correct78% picked this

    presumes, without providing justification, that if certain events each produce a particular result, then no other event is

    Why this is right

    This describes logic that is bidirectional. It presents the assumption which reverses the logic of the club’s bylaw.

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

  3. Bad Objection16% picked this

    takes for granted that an assumption required to establish the argument's conclusion is sufficient to

    The most glaring assumption the author is making is that "these are the only two ways to get suspended". That assumption is required to establish the conclusion. But we couldn't be mad if the author was acting like that assumption would also be sufficient. That assumption would be sufficient! We're mad at the author for assuming "there are only two ways to get suspended". This answer is saying we're mad that the author thinks such an assumption is sufficient. We can't be mad at that, because such an assumption is sufficient. If we say, "there are only two ways to get suspended: X and Y. Thibo got suspended and didn't do Y. Thus, he must have done X", that is rock solid logic.

  4. Out of Scope1% picked this

    fails to specify at what point someone arriving at a club meeting is

    The argument does not rest on the point someone arriving at a club meeting is officially deemed late.

  5. Out of Scope0% picked this

    does not specify how long Thibodeaux has been

    The length of time Thibodeaux has been an officer is not relevant to the argument.

Continue the review in LSAT Lab

Save this question, watch the video walkthrough, and drill similar questions in your LSAT Lab account.

LSAT Lab

Turn this review into a targeted study plan.

Save this question, drill more like it, watch the video walkthrough, and track your progress in your LSAT Lab account.

Start practicing free