medium · LSAT Logical Reasoning

Every valid argument has true premises. This argument is not valid. Therefore, this argument has at least one false premise.

The reasoning above is most similar in its flawed reasoning to which one of the following?

  1. Every professional athlete exercises daily. Sarah is not a professional athlete. So Sarah does not exercise daily.
  2. If it rains, the grass surely gets wet. The grass is not wet at all. So it definitely did not rain today.
  3. All ordinary house cats have fur. Whiskers clearly has fur. So Whiskers must indeed be a cat of some kind.
  4. No valid argument has even one false premise. So no argument that has a false premise could ever turn out valid.
  5. Most diligent students study very hard. John happens to be a student. So John surely studies quite hard too.

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