Statement:
All cups are bowls.
All bowls are trays.
Some trays are plates.
Conclusion:
I. Some trays are cups.
II. Some bowls are plates.
III. No bowl is a plate.
All cups are bowls(A) + All bowls are trays(A) → All cups are trays(A) → conversion → Some trays are cups(I). Hence, conclusion I will follow. A + I → No conclusion. Hence, neither conclusion II nor III will follow but they will make a complementary pair. Hence, either conclusion II or III will follow.