medium · LSAT Logical Reasoning

Some accountants are marathon runners, and some marathon runners are vegetarians. A commentator concludes that, therefore, some accountants are vegetarians.

The reasoning in the commentator's argument is flawed because it fails to recognize that

  1. the marathon runners who are accountants and the marathon runners who are vegetarians might be two entirely separate groups
  2. the word 'some' might here secretly stand for 'all,' a reading that would only make the stated conclusion far too sweeping
  3. it might in fact turn out, contrary to the second stated premise, that no marathon runners are vegetarians at all whatsoever
  4. the argument has quietly switched the sufficient and necessary conditions that are attached to being a marathon runner
  5. some accountants might themselves happen to be marathon runners who, as it so happens, also avoid eating any meat at all

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