Statements: Only a few lines are parallels. All parallels are perpendicular. No parallel is a triangle. Conclusions:
I. All perpendicular being line is a possibility
II. All triangle being perpendicular is a possibility.
III. Some triangle are lines.

Some lines are parallels (I) + All parallels are perpendicular (A) → Some lines are perpendicular (I) → Probable conclusion → All perpendicular may be line (A). Hence conclusion I follows. No parallel is a triangle (E) → Conversion → No triangle is a parallel (E) + All parallels are perpendicular (A) → Some perpendiculars are not triangle (O*) → Probable conclusion → All triangle may be perpendicular (A). Hence conclusion II follows. Some lines are parallels (I) + No parallel is a triangle (E) → Some lines are not triangle (O). Hence conclusion III does not follow.