Logical ReasoningDifficulty: Easy

PT131 S2 Q9 Explanation

No member of the Richardson

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

TopicsParallel Flaw

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Stimulus

No member of the Richardson Theater Group is both a performer and an administrator. Since Leon and Marta are both members of the Richardson Theater Group but follows that both are performers.

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
9.

Which one of the following arguments displays a flawed pattern of reasoning most similar to that in

Answer choices

  1. Bad Premise / Conclusion Match1% picked this

    Not all of the employees of the Tedenco Company are salaried employees of that company. Since Mr. Lopez and Ms. Allen are both salaried

    The first claim is "not all X's are Y", which doesn't match anything in the original, so I would stop reading there. The conclusion is also about other people, not about our two characters, so that also doesn't match the original.

  2. Not a Flaw3% picked this

    No employee of the Tedenco Company is both an accountant and a corporate attorney. Since Ms. Walsh is both an accountant and a corporate

    This is valid logic. No one at Tedenco Company is both X and Y. Since Walsh is both X and Y, then it is correct to infer that she is not part of Tedenco Company.

  3. Correct86% picked this

    No company can have its headquarters in both Canada and Mexico. Since neither the Dumone Company nor the Tedenco Company has its headquarters in

    Why this is right

    Nothing in the category of "company" can have headquarters in both Canada and Mexico. Dumone and Tedenco are both companies. Dumone and Tedenco do not have headquarters in Mexico. Thus, they have their headquarters in Canada. We'd have a similar objection: "just because you can't have headquarters in both Canada and Mexico doesn't mean you must have your headquarters in one or the other. Maybe your headquarters is in neither one of them. (It's in the Cayman Islands, duh)

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

  4. Not a Flaw10% picked this

    No corporate attorney represents both the Dumone Company and the Tedenco Company. Since Ms. Tseung is a corporate attorney who represents the Dumone Company,

    This is valid logic. If no corporate attorney represents both Dumone Company and Tedenco Company, and Tseung is a corporate attorney who represents Dumone Company, then it is valid to conclude that she cannot also represent Tedenco Company.

  5. Trap1% picked this

    No member of the board of directors of the Dumone Company is also a member of the board of directors of the Tedenco Company.

    Bad Premise / Conclusion Match Not a Flaw This starts off with the "if you're in this category, you can't be both X and Y" conditional. But then it veers off into a strange math land that doesn't resemble the original. Also, the math is totally valid.

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