Suppose users share a 3 Mbps link. Also suppose each user requires 150 kbps when transmitting, but each user transmits only 10 percent of the time. (See the discussion of packet switching versus circuit switching in textbook)

Now consider a problem of finding the probability that there is k or more users transmitting simultaneously out of 120 users. Value of k could be 2, 3 or 4. For this problem, you dont need to find the exact answer, but rather discuss how you would approach this problem. What would one of the ways to possibly find the answer. [ hint: if P(x) + P(y) = 1, so P(x) = 1 P(y) ] [If you feel comfortable in finding the result, please do so to show your work; however that wont add or subtract any points]