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Statements: All keys are locks. All locks are doors. All doors are walls. Conclusions: I. All keys are walls.
II. All walls are keys. Which conclusion(s) follow?

Competition practiceSyllogism
  • ANeither conclusion follows
  • BOnly conclusion II follows
  • CBoth conclusions follow
  • DOnly conclusion I follows

Step-by-Step Solution

The chain keys < locks < doors < walls makes all keys walls (I). The reverse inclusion 'all walls are keys' is not supported, so II fails.
Answer: D) Only conclusion I follows

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