Three statements are given, followed by three conclusions (I), (II), and (III). You have to consider these statements to be true, even if they seem to be at variance from commonly known facts. You are to decide which of the given conclusions logically follow(s) from the given statements.
Statements:
(1) No chair is table
(2) Some benches are tables
(3) All chairs are Almirahs
Conclusions:
(I) Some Almirahs are tables
(II) Some benches are chairs
(III) No table is Almirah

Statements:
(1) No chair is table
(2) Some benches are tables
(3) All chairs are Almirahs

Chairs are Almirahs, but chairs are not tables.
Benches are partly tables, but no link is given between benches and Almirahs.
So this conclusion does not definitely follow.

Conclusion (II): Some benches are chairs
No relation is given between benches and chairs.
So this conclusion does not follow.

Conclusion (III): No table is Almirah
We only know that chairs (which are Almirahs) are not tables.
But it is possible that some Almirahs (other than chairs) may be tables.
So this conclusion does not definitely follow.

However, conclusion (I) and conclusion (III) are contradictory:

(I) says some Almirahs are tables

(III) says no table is an Almirah

Both cannot be true together, but one of them must be true.