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Statements: All windows are doors. No door is a wall. Conclusions: I. No window is a wall.
II. Some doors are windows. Which conclusion(s) follow?

Competition practiceSyllogism
  • AOnly conclusion I follows
  • BOnly conclusion II follows
  • CBoth conclusions follow
  • DNeither conclusion follows

Step-by-Step Solution

All windows are doors and no door is a wall, so no window is a wall (I follows). Conversion of 'all windows are doors' gives 'some doors are windows' (II follows).
Answer: C) Both conclusions follow

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