Logical ReasoningDifficulty: Hard

PT129 S1 Q9 Explanation

One should always capitalize the main words

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

TopicsMust be True

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Stimulus

One should always capitalize the main words and the first and last words of a title. But one should never capitalize articles, or prepositions and conjunctions with fewer than in the middle of a title.

What this question is testing

Must be True

The Rules

Two rules in the stimulus. Rule 1 says some words always get capitalized (main words, first/last words). Rule 2 says some words never get capitalized in the middle of a title — articles, and prepositions or conjunctions with fewer than five letters.

Evaluate

The trick on Must-Be-True questions is to combine the rules to draw a tight inference. If a middle-of-title word should be capitalized, then it cannot be in the never-capitalize category. That is, it cannot be an article, and it cannot be a short conjunction or preposition.

Goal

Find the answer that exactly captures this contrapositive. Watch for answers that switch directions, overstate, or stray from the rules.

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 can be properly inferred from the

Answer choices

  1. Reversal15% picked this

    If a word that is a preposition or conjunction should be capitalized, then it is the first or

    This says: if a preposition or conjunction should be capitalized, then it is the first or last word. But the rules allow other ways such a word could be capitalized — for instance, a five-or-more-letter preposition in the middle of a title is not blocked from being capitalized (the never-capitalize rule only covers under-5 prepositions). So a preposition could be capitalized while not being first or last. This does not follow.

  2. Correct64% picked this

    If a word in the middle of a title should be capitalized, then that word is neither an article nor a

    Why this is right

    This is the contrapositive of Rule 2. Rule 2 says articles and short conjunctions (and prepositions) in the middle of a title should never be capitalized. By contrapositive: if a middle-of-title word should be capitalized, it cannot be an article and cannot be a conjunction shorter than five letters. The answer correctly drops out the "preposition" piece because it focuses only on articles and short conjunctions — a strict subset of the never-capitalize categories. This must be true.

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

  3. Too Strong4% picked this

    All prepositions and conjunctions with fewer than five letters should be

    The rule only restricts short prepositions and conjunctions in the middle of a title. If such a word is the first or last word, Rule 1 says it gets capitalized. So we cannot conclude all short prepositions and conjunctions stay uncapitalized — those at the start or end must be capitalized.

  4. Unsupported10% picked this

    If a word is neither a main word nor a first or last word of a title, then

    The stimulus only tells us when to capitalize and when not to — it does not say all other words should remain uncapitalized. There could be other categories of words that also get capitalized for other reasons. The rules do not give us a complete picture of every word; they only specify two categories.

  5. Out of Scope6% picked this

    Prepositions and conjunctions with five or more letters should be capitalized

    The stimulus only addresses titles. This answer talks about "any text" — broadening to ordinary writing. The rules say nothing about whether prepositions and conjunctions get capitalized outside titles. This goes beyond what the stimulus supports.

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