The Bulb Experiment

There are N number of students sitting in a circular table in a electronics lab. The bulb is at position A with respect to first person. The bulb is presently with ith person with respect to A in clockwise direction . A wants to perform some experiments using that bulb . so the bulb is to be passed from I to A in clockwise direction . if the first person to pass the bulb passes it to Pth person wr