medium · LSAT Logical Reasoning

Each runner on the championship relay team is, on her own, one of the fastest sprinters in the entire league. Therefore, this relay team must be the fastest relay team in the entire league.

The reasoning in the argument is flawed because the argument

  1. presumes that a characteristic holding for each member of a group must therefore hold for the group taken as a single whole
  2. treats a condition that would merely permit the stated outcome as though it were one strictly required for that outcome
  3. offers no real evidence that the sprinters in question actually compete together as one and the very same relay team
  4. exploits the word 'fastest' by quietly shifting back and forth between two distinct, incompatible senses of that term
  5. assumes that each runner is among the very fastest sprinters rather than merely somewhat faster than average competitors

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