Statements: a. Some authors are teachers.
b. All teachers are poets.
c. Some poets are artists.
Conclusions:I. Some authors are poets.
II. Some teachers are artists.
III. Some poets are teachers.
Some authors are teachers(I) + All teachers are poets(A) ⇒ Some authors are poets. Hence conclusion I follow. All teachers are poets(A) + Some poets are artists(I) ⇒ No conclusion. Hence conclusion II does not follow. All teachers are poets(A) ⇒ Conversion ⇒ Some poets are teachers(I). Hence conclusion III follows.