Any syllogism with three terms, each of which is distributed in both of its occurrences, cannot possibly be. [Hint]
A syllogism with one negative premise and one affirmative premise has a conclusion. [Hint]
The and figure of a syllogism determine its form. [Hint]
Diagramming the of an argument should suffice to diagram its conclusion as well. [Hint]
A valid syllogism will always the middle term in at least one premise. [Hint]
