Seven Colleagues , Arun, Babita, Chetan , Dhruv, Eshan, Firoz and Gaurav work on seven different floors of the same building, having floors in such a manner that the ground floor is numbered 1, the floor above it number 2, and so on till the topmost floor is numbered 7. Arun works on floor number 1. Eshan works on the floor which is immediately above Arun's Floor. Only four Colleagues works on the floors between the floors of Eshan and Babita. Only three Colleagues works on the floors between the floors of Dhruv and Arun. Firoz works on the floor immediately below of Chetan's floor. On which floor does Gaurav work?