All nurses on ward 4 are trained in resuscitation. Some trained in resuscitation also work on the night shift. Which conclusion must be true?

Answer and explanation

Correct answer: B. Some people trained in resuscitation work on the night shift

  1. Step 1: Write the premises as sets: ward 4 nurses sit inside the resuscitation group, and the night shift overlaps that group. Step 2. Only the overlap of the night shift with the resuscitation group is guaranteed, not its overlap with ward 4. Answer: Some people trained in resuscitation work on the night shift. Why not the others: The night-shift overlap may lie wholly outside ward 4, so 'Some nurses on ward 4 work on the night shift' is possible but not certain; 'All night-shift workers are trained in resuscitation' reverses the 'some'; 'No nurse on ward 4 works on the night shift' is also not forced.

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