HI could anyone please help me with these two questions. (Networks)

A disadvantage of the contention approach for LANs is the capacity wasted due to multiple stations attempting to access the channel at the same time. Suppose that time is divided into discrete slots, with each of N stations attempting to transmit with probability p during each slot. What fraction of slots is wasted due to multiple simultaneous transmission attempts? Follow-up question of Problem 2. Plot in a single graph three curves representing the fraction of slots wasted as a function of p (ranging from 0 to 1) for N = 2, 20, and 200, respectively