1. 

Statements: All aeroplanes are trains. Some trains are chairs.

Conclusions:

I.   Some aeroplanes are chairs.

II.  Some chairs are aeroplanes.

III. Some chairs are trains.

IV. Some trains are aeroplanes.

A. None follows
B. Only I and II follow
C. Only II and III follow
D. Only III and IV follow

Answer: Option D

Explanation:

Since the middle term 'trains' is not distributed even once in the/premises, no definite conclusion follows. However, III is the converse of the second premise while IV is the converse of the first premise. So, both of them hold.