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

Competition practiceSyllogism
  • AOnly I follows
  • BNeither I nor II follows
  • COnly II follows
  • DBoth I and II follow

Step-by-Step Solution

All keys are locks and no lock is a door forces no key to be a door (I). Conclusion II contradicts this and fails.
Answer: A) Only I follows

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