Logical ReasoningDifficulty: Easy

PT114 S2 Q25 Explanation

In our solar system only one of

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

TopicsFlaw

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Stimulus

In our solar system only one of the nine planets—Earth—qualifies as fit to sustain life. Nonetheless, using this ratio, and considering the astonishingly large number of planetary systems in the universe, we must conclude that the some form of life is extremely large.

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
25.

The argument is questionable because it presumes which one of the following

Answer choices

  1. Trap7% picked this

    If a planet is Earthlike, then life will arise

  2. Correct79% picked this

    Our solar system is similar to many other planetary systems in

    Why this is right

    Answer B is correct.

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

  3. Trap2% picked this

    The conditions necessary for life to begin are

  4. Trap5% picked this

    Life similar to Earth’s could evolve under conditions very different from

  5. Trap7% picked this

    Most other planetary systems in the universe have

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