Th e Hay Group lists the top 20 Best Companies for Leadership annually. According to the latest report, General Electric is number 1, followed by Procter & Gamble and Intel Corporation. Suppose that of the 20 fi rms on the list, eight are in some type of computer-related business and that fi ve fi rms are randomly selected.

a. What is the probability that none of the fi rms is in some type of computer-related business?

b. What is the probability that all fi ve firms are in some type of computer-related business?

c. What is the probability that exactly two are in non-computer-related business?