No sand castles are permanent structures. Therefore, some sand castles are not permanent structures.
A) Invalid, illicit subcontrary.
B) Invalid, illicit subalternation.
C) Valid, no fallacy.
D) Invalid, illicit contrary.
E) Invalid, illicit conversion.

Question

Quizplus · Accepted Answer

The argument is valid and there is no fallacy. It is a simple statement of fact that sand castles are not permanent structures, so the conclusion that some sand castles are not permanent structures logically follows. The argument does not make any assumptions or use any flawed reasoning.

No Sand Castles Are Permanent Structures