Logic quiz 2

This logic quiz would have been more interesting if the instructions had said “choose the least bad answer.”

Choose the least bad answer: If all whales are triangular, then

  1. no whales are triangular.
  2. some whales are not triangular.
  3. some whales are triangular.
  4. all four of these answers are equally bad.

UPDATE 17 May 2014: The answers.

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