easy · LSAT Logical Reasoning

To get a driver's license, one must pass a vision test. Since John has a driver's license, he must have passed a vision test.

The argument proceeds by

  1. reasoning that, because an outcome was attained, a precondition for that outcome was necessarily satisfied.
  2. treating a sufficient condition as though it were instead merely a necessary one for holding the license.
  3. offering a causal account of why John personally chose to go out and obtain his driver's license at all.
  4. extending John's single particular case into a sweeping general rule covering all licensed drivers everywhere.
  5. establishing that passing a vision test, entirely by itself, is enough to guarantee one a driver's license.

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