Statements: Some trucks are buses.
All buses are cars.
All cars are bikes.
Conclusions: I. Some trucks are bikes.
II. Some cars are buses.
III. Some trucks are cars.
Some trucks are buses (I) + All buses are cars ⇒ Some trucks are cars(I) + All cars are bikes ⇒ Some trucks are bikes (I). Hence, conclusion I and III follows. All buses are cars (A) ⇒ Conversion ⇒ Some cars are buses(I).Hence, conclusion II follows.