Logical ReasoningDifficulty: Hard

PT142 S1 Q20 Explanation

If the city builds the proposed convention

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

TopicsSufficient Assumption

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Stimulus

If the city builds the proposed convention center, several national professional organizations will hold conventions there. And if several large conventions are held in the city, the total number of visitors will of course increase. Tax revenues will certainly increase if the convention center will increase the city's tax revenues.

What this question is testing

Sufficient Assumption

Your task

Find the assumption that, if added, guarantees the conclusion follows.

Common trap

Answers that only partly bridge the gap, leaving the conclusion unproven.

Winning move

Identify the new term in the conclusion and pick the choice that links it to the evidence.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
20.

The conclusion of the argument follows logically if which one of the

Answer choices

  1. Unrelated to Goal6% picked this

    If the number of visitors to the city does not increase, then the city's tax

    There's only one thing we're interested in finding — "these conventions that would be held by national professional organizations" will be "LARGE conventions". This answer just takes a conditional we already had and negates both ideas.

  2. Unrelated to Goal24% picked this

    If the number of visitors to the city increases, then the amount of money spent

    There's only one thing we're interested in finding — "these conventions that would be held by national professional organizations" will be "LARGE conventions". We're already guaranteed that if the number of visitors goes up, then tax revenue goes up. This answer seems to be trying to extra-convince us of that, but we already have that relationship established.

  3. Unrelated to Goal7% picked this

    The city's tax revenues will not increase unless the convention center

    There's only one thing we're interested in finding — "these conventions that would be held by national professional organizations" will be "LARGE conventions". This answer just does an illegal reversal on the conclusion. The conclusion was if convention center, then increase tax revenues and this says if not convention center, then not increase tax revenues

  4. Unrelated to Goal8% picked this

    People who are now regular visitors to the city will continue to visit the city if the new

    There's only one thing we're interested in finding — "these conventions that would be held by national professional organizations" will be "LARGE conventions". We already know that if we get large conventions, we're guaranteed total visitors will increase, whether or not that involves current visitors continuing to come or no longer coming. In either case, the net effect would be more visitors, according to the provide rule.

  5. Correct55% picked this

    If several national professional organizations hold their conventions in the convention center, those conventions

    Why this is right

    This was the only missing detail. Here is us adding this fact to our premises. 1.If build center, several national pro orgs will have conventions 2. if several national pro orgs have conventions, they will be large 3. if large conventions are held, number of visitors will increase 4. if number of visitors increase, then tax revenue increases. We can now go seamlessly from the beginning to the end: if build center, then tax revenue increases.

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

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