Statements: All rollers are coasters.
Some swings are rollers.
All bridges are swings.
. Conclusions: I. All coasters being swings is a possibility.
II. Some swings are not bridges.
III. At least some rollers are definitely swings.
Some swings are rollers(I) + All rollers are coasters(A) ⇒ Some swings are coasters(I) ⇒Probable conclusion ⇒ All coasters may be swings(A). Hence, conclusion I follows. All bridges are swings(A) ⇒ Conversion ⇒ Some swings are bridges(I). Hence, conclusion II does not follow. Some swings are rollers(I) ⇒ Conversion ⇒ Some rollers are swings(I). Hence, conclusion III follows.