Due to a manufacturing error, five cans of regular soda were accidentally filled with diet soda and placed into a 18-pack. Suppose that two cans are randomly selected from the 18-pack. Complete parts (a) through (c). (a) Determine the probability that both contain diet soda. P(both diet)=(Round to four decimal places as needed.) (b) Determine the probability that both contain regular soda. = P(both regular) (Round to four decimal places as needed.) Would this be unusual? No Yes (c) Determine the probability that exactly one is diet and exactly one is regular. P(one diet and one regular)= (Round to four decimal places as needed.)