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Statements: All keys are locks. No lock is a door. Conclusions: I. No key is a door.
II. Some locks are keys. Which conclusion(s) logically follow?

Competition practiceSyllogism
  • ABoth I and II follow
  • BOnly conclusion II follows
  • COnly conclusion I follows
  • DNeither I nor II follows

Step-by-Step Solution

All keys are locks and no lock is a door, so no key is a door (I). 'All keys are locks' converts to 'some locks are keys' (II). Both follow.
Answer: A) Both I and II follow

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