There are seven persons i.e., A,B,C,D,E,F andG live on seven different floors of a building but not necessarily in the same order. Lowermost floor of the buildinig is numbered as 1 and top most floor which is numbered as 7.
There are four persons living between F's floor and D's floor. A lives just above F's floor. there are more than three persons living between A's floor and G's floor. C lives immediately above B'sfloor but doesn't live on an even numbered floor. E doesn't live on the floors below D's floor.

Explanation

Step I: Let us tart with its detail solution. Seven persons live on seven different floors of a building such as lowermost floor of the building is numbered as 1 and top most floor which is numbered as 7. first arrange the floors in tabular form. Now, there are four persons living between F.s floor. A lives just above F.s floor. So, there will be three possible cases

Step II: There are more than three persons living between A.s floor and G.s floor. from this case-2 will be eliminated as there is no place left for G. now continue with case-1 and case-3.

Step III: C lives immediately above B.s floor but doesn.t live on an even numbered floor. so, in both cases-1 and 3, C lives on 5th floor and B lives on 4th floor.

Step IV: E doesn.t live on the the floors below D.s floor. from this condition case-1 will be eliminated. now with case-3, E lives on 3rd floor. so, the final arrangement is