Statements:Some pins are needles.
All needles are ropes.
Some ropes are buckets.
All buckets are trees.
Conclusions:I. Some buckets are pins.
II. Some ropes are pins.
III. No bucket is pin.
Some pins are needles(I) + All needles are ropes(A) ⇒ Some pins are ropes(I) + Some ropes are buckets(I) ⇒ No conclusion. Hence conclusion I & III do not follow but they will make complementary pair. Hence, either conclusion I or III follows. Some pins are needles(I) + All needles are ropes(A) ⇒ Some pins are ropes(I) ⇒ Conversion ⇒ Some ropes are pins(I). Hence, conclusion II follows.