Take two stations on a broadband bus at a distance of $2$ KM form each other. Let the data rate be $1$Mbps$,$ the frame length be $100$ bits and the propagation velocity be $2,000,000$ Km$/$s$.$ Each station generates average rate of $2000$ frames per second. For the ALOHA protocol, if the station start the transmission at time t$,$ what is the probability of collision? Calculate the same for slotted ALOHA