No teacher is lazy. Some employees are teachers. Which conclusion follows?

  • A. All employees are lazy
  • B. Some employees are not lazy
  • C. No employee is lazy
  • D. Some teachers are employees only

Explanation

The employees who are teachers cannot be lazy, so at least some employees are not lazy, but the rest are unaccounted for. Concluding that no employee is lazy goes far beyond the premises. The valid conclusion is always the weakest one the premises actually support.

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