Practice question

What is the correct negation of the sentence 'No flight is delayed when the weather is good'?

  1. There is at least one flight that is delayed even though the weather is good
  2. All flights are delayed when the weather is good
  3. No flight is delayed when the weather is bad
  4. At least one flight departs on time in good weather

Answer: A — There is at least one flight that is delayed even though the weather is good

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