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Question
Whenever the wind blows too hard, the doors and windows are not opened.
A. The doors and windows are opened.
B. The doors and windows are not opened.
C. The wind blew too hard.
D. The wind did not blow too hard.
Options:
A .  AC
B .  DA
C .  AD
D .  BC
Answer: Option C
:
C
Whenever X occurs, Y occurs, however whenever X does not occur, one cannot say what is true of Y. Therefore AD is valid, but not DA.

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