medium · LSAT Logical Reasoning

The claim that this accounting software is the best on the market must be true, because it was written by the lead developer of the world's most successful operating system.

The reasoning above is most vulnerable to criticism on the grounds that it

  1. leans on the prestige of an individual whose demonstrated skill lies in a field distinct from the one in which the quality claim is made
  2. fails to settle in advance whether the parties to the dispute share a common understanding of what counts as the best product
  3. treats one condition that would establish a product's superiority as though it were the only condition that could establish it
  4. overlooks the possibility that the world's most successful operating system was itself the product of a large team rather than a single developer
  5. presumes, without offering support, that no rival product could ever be written by an equally accomplished developer

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