Who lives on the 4th floor?

K lives on the top floor. F is in the middle of the North facing people’s row. G lives on the 3^rdfloor. There are exactly three floors between K and I. H and E sit at the extreme ends of the row and face south. Case-2  C sits to the left of H. This is not possible in Case II, therefore, Case II will be eliminated. H and E sit at the extreme ends of the row and face south. J and C sit opposite to each other. The person living on the 5^thfloor (i.e. I) sits opposite to H and faces north. J lives above C’s floor J does not live on 8^thor 7^thfloor. J cannot be on 6^th or 4^th floor also as C lives immediately below J. (so, J lives on 2^nd floor and C on 1^st floor) D sits third to the right of J. D does not sit adjacent to vacant place. (Therefore, vacant place is in the south facing row.) G faces south. K faces the vacant place. The persons at the extreme ends of the north facing row are immediately next to each other’s floor (i.e. I and D). G is not immediately next to D’s floor. H and E are immediately next to each other’s floor. Case-1 Case-2