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Statements: All windows are doors. Some doors are walls. Conclusions: I. Some windows are walls.
II. No window is a wall. Which conclusion follows?

Competition practiceSyllogism
  • ABoth I and II follow
  • BOnly II follows
  • CEither I or II follows
  • DOnly I follows

Step-by-Step Solution

The overlap of windows with walls is undetermined. Conclusions I and II are complementary and together exhaust all cases, while neither can be proved alone, so either I or II follows.
Answer: C) Either I or II follows

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