Logical ReasoningDifficulty: Hard

PT106 S3 Q12 Explanation

Letter to the Editor: Your article

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

TopicsMust be False

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Stimulus

Letter to the Editor: Your article on effective cockroach control states that vexone is effective against only one of the more than 4,000 cockroach species that infest North America: the German cockroach. In actuality, vexone has been utilized effectively for almost a decade against all of the species that infest North America. we have conducted many well-documented studies that prove this fact.

What this question is testing

Must be False

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
12.

Each of the following statements conflicts with the letter writer’s

Answer choices

  1. Conflicts6% picked this

    Vexone is effective against only two species of cockroach that infest

    The author said that vexone is effective against all the species that infest North America. This answer seems to be saying that vexone is ineffective against all but two species of cockroach that infest North America.

  2. Conflicts7% picked this

    Not all of the major species of cockroach that infest North America can be controlled

    The final sentence is saying that Roach Ender "has been utilized effectively" for almost a decade against all of the species that infest North America. This answer is saying, "some species of cockroach that infest North America cannot be controlled by Roach Ender".

  3. Correct68% picked this

    Every species of cockroach that infests North America can be controlled

    Why this is right

    This matches what the author is saying in the second sentence, so it doesn't conflict with the author's view. It is the author's view.

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

  4. Conflicts7% picked this

    The cockroach infestations that have been combated with vexone have not included all of the cockroach species

    The author says that vexone has been used effectively for almost a decade against all of the species that infest North America. But this answer is saying that vexone hasn't actually combated all the cockroach species that infest North America.

  5. Conflicts13% picked this

    Roach Ender was tested against exactly 4,000 cockroach species that infest

    Since the author is boasting that Roach Ender has been shown in tests to be effective against all of the species that infest North America, and since the author that there are "more than 4,000 cockroach species in North America", the author must believe that Roach Ender has been tested on "more than 4000 species".

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