Logical ReasoningDifficulty: Medium

PT109 S3 Q5 Explanation

The radiation absorbed by someone

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

TopicsFlaw

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Stimulus

The radiation absorbed by someone during an ordinary commercial airline flight is no more dangerous than that received during an ordinary dental X-ray. Since a dental X-ray does negligible harm to a person, we can conclude that the radiation crews will also do them negligible harm.

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.

A flaw in the argument is its failure to

Answer choices

  1. Trap9% picked this

    there may be many forms of dangerous radiation other than X-rays and the kinds of radiation absorbed by members

  2. Trap7% picked this

    receiving a dental X-ray may mitigate other health risks, whereas flying

  3. Trap2% picked this

    exposure to X-rays of higher intensity than dental X-rays may

  4. Correct80% picked this

    the longer and the more often one is exposed to radiation, the more radiation one absorbs and the

    Why this is right

    Answer D is correct.

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

  5. Trap3% picked this

    flying at high altitude involves risks in addition to exposure to

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