All benches are desks (A) ⇒ conversion = Some desks are benches (I) ⇒ possible concl. ⇒ All desks may be benches (A). Hence, I follows. Here, all the given statements are positive statements and conclusion II is a negative conclusion. As we know that no negative define conclusion can be drawn from the positive statement, we can say that conclusion II will not follow. All chairs are tables.(A) + All tables are benches.(A) = All chairs are benches.(A) ⇒ conversion ⇒ Some benches are chairs.(I), Hence, conclusion III does not follow.
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