Logical ReasoningDifficulty: Hard

PT116 S3 Q21 Explanation

Each of the many people

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

TopicsMust be True

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Stimulus

Each of the many people who participated in the town’s annual spring cleanup received a community recognition certificate. Because the spring cleanup took place at the same time as the downtown arts fair, we know that there are at not active in the town’s artistic circles.

What this question is testing

Must be True

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
21.

If the statements above are true, which one of the following must

Answer choices

  1. Out of Scope: active in circles8% picked this

    Some of the persons who are active in the town’s artistic circles received

    The paragraph didn't provide any information about people who are active in the town's artistic circles, so we can't derive any fact about them. It's somewhat suggested that people who attended the downtown arts fair are active in the town's artistic circles, but we were never told that people who attended the arts fair received any certificate.

  2. Correct71% picked this

    Not all of those who received community recognition certificates are active in the

    Why this is right

    Whenever we see negative formulations (no, few, not all), we convert them into their positive equivalents. No A's are B = All A's are ~B Few A's are B = Most A's are ~B Not all A's are B = Some A's are ~B So this answer is saying, "Some of those who received community recognition certificates are not active in the town's artistic circles". Yes, that's what we predicted. We know that some people who were at the spring cleanup are not active in the town's artistic circles, and we know that everyone at the spring cleanup received a certificate. So we can derive that some people not active in artistic circles received the certificate. Or, if you prefer, formally: Some NAAC are SCP + All SCP are RCRC ---------------------------------------- Some NAAC are RCRC (NAAC = not active artistic circles, SCP = spring cleanup participant, RCRC = received community recognition certificate)

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

  3. Illegal Negation12% picked this

    No participants in the downtown arts fair received community

    We have no means of proving that anyone didn't receive a certificate. We were only provided a rule that allows us to derive that someone did receive a certificate: attended spring cleanup ? rec'd certificate This answer is trying to bait people into thinking via this illegal negation: participated ? not attended ? not received in arts fair spring cleanup certificate

  4. Illegal Reversal9% picked this

    No person who received a community recognition certificate has not participated in

    This is a double negative, which implies a positive. "None of my friends have not seen the new Spiderman" means that "All of my friends have seen the new Spiderman". So this is saying, "All people who received a certificate have participated in the spring cleanup." That would just be illegally reversing the conditional we were given: attended spring cleanup ? rec'd certificate This answer is trying to bait people into thinking via this illegal reversal: rec'd certificate ? attended spring cleanup

  5. Out of Scope: town's environment0% picked this

    Persons who are active in the town’s artistic circles are not concerned with

    This concept of "concern for the town's environment" is wholly new and thus could not be derived from the existing text.

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