medium · LSAT Logical Reasoning

If you attend the lecture, you will receive a certificate. You did not receive a certificate. Therefore, you did not attend the lecture.

Which one of the following most accurately describes the reasoning above?

  1. It validly infers the falsity of a sufficient condition from the falsity of its necessary consequence.
  2. It invalidly infers the absence of the promised consequence from the mere absence of the triggering condition.
  3. It simply restates one of its own premises as its conclusion, without supplying any genuine support.
  4. It diverts attention toward a side consideration that is irrelevant to the precise issue at hand.
  5. It invalidly infers that the triggering condition held from the reported presence of the consequence.

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