1. Statements: All windows are doors. No door is wall. Conclusions: No window is wall. No wall is door.
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By: guest on 02 Jun 2017 01.28 am
Since both the premises are universal and one premise is negative, the conclusion must be universal negative. Also, the conclusion should not contain the middle term. So, I follows. However, II is the converse of the second premise and thus it also holds,