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Discussion

Statements: All the windows are doors. No door is a wall.

Conclusions:

1. Some windows are walls.

2. No wall is a door.

  • A.Only (1) conclusion follows
  • B.Only (2) conclusion follows
  • C.Either (1) or (2) follows
  • D.Neither (1) nor (2) follows

Answer: B

Correct answer: Only (2) conclusion follows

No door is a wall, and that converts: no wall is a door - conclusion 2. Conclusion 1 is ruled out altogether, since all windows are doors and no door is a wall. Only 2 follows.

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