A multichannel microwave link is to provide telephone communication to a remote community having 12 subscribers, each of whom uses the link 20% of the time during pick hours. How many channels are needed to make the link available during pick hours to:
(a) Eighty percent of the subscribers all of the time?
(b) All of the subscribers 80% of the time?
(c) All of the subscribers 95% of the time?
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