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ztlbox 发表于 2004-8-23 08:45
7. All psychiatrists are doctors. Only psychiatrists were invited to the conference. All who were in ...
All P ---> D
C --- > P
All C ----> H
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C ---> P ---> D
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So H ---> P
So, it must be C ---> H ---> P ---> D
SO, All H must be D, in the other word, Only doctor would be in H hotel.
A. H ---> C. Mistaken Reverse.
B. C ---> P. ( Premises Booster )
C. P ---> C. ( Mistetaken Reverse )
D. C ---> No ( No ) H => C ---> H ( Premises Booster )
E. H ---> D ( Must be true ). Correct answer.
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