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All trained professionals follow safety protocols. Some staff members do not follow safety protocols. Which conclusion definitely follows?

A. No staff members are trained professionals
B. Some staff members are not trained professionals ✅
C. All staff members are trained professionals
D. All trained professionals are staff members

Explanation

  • All A are B (trained => follow protocol). Some staff do NOT follow protocol, so they cannot be trained (A)
  • Hence some staff are not trained professionals