Statement : All hotels are rooms.
All rooms are flats.
All flats are buildings.
No building is apartments.
Conclusion: Some buildings may not be rooms.
Some apartments are not flats.
Some apartments are flats.
All hotels are buildings.
all rooms are flats (A) + All flats are buildings (A)→ All rooms are buildings (A)→ Conversion→ some buildings are rooms (I)→ probable conclusion→ Some buildings may not be rooms (I). Hence, Conclusion I follows. All flats are buildings (A) + No building is an apartment (E)→ No flat is an apartment (E)→ Conversion→ Some apartments are not flats (O). Hence, conclusion II follows but conclusion III does not follow. All hotels are room (A) + All rooms are flats (A)→ All hotels are flats (A) + All flats are buildings (A)→ All hotels are buildings. Hence, conclusion IV follows.