A, B, C, D, E and F live on six different floors of the same building. The lowermost floor in the building is numbered 1, the floor above it is numbered 2, and so on till the topmost floor is numbered 6. E lives on the floor immediately below F's floor. D lives on the 2nd floor. C lives on the floor immediately below A's floor. F does not live on the 5th floor. On which floor does B live?

The building has floors numbered 1 to 6.

E lives on the floor immediately below F's floor.

D lives on the 2nd floor.

C lives on the floor immediately below A's floor.

F does not live on the 5th floor.

From the given information living arrangement will be -

F cannot live on floor 5 

F cannot live on floor 2, because D already occupies it.

If F lives on floor 3, then E lives on floor 2, but this conflicts with D living on floor 2.

F must live on floor 6, so E lives on floor 5.

A must live on a floor above C

The only floors available above floor 2 (occupied by D) and floor 5 (occupied by E) are floors 3 and 4.

A lives on floor 4, and C lives on floor 3.

The only remaining floor is floor 1.

Thus, correct answer is (b)