The queries in a BPI customer service hotline are attended 60% of the time. Assume that the events that the queries are attended on successive calls are independent. Assume that 12 calls are  placed to the hotline.  (a) What is the probability that for exactly six calls the queries are occupied?  (b) What is the probability that for at least one call the queries are not attended?  (c) What is the expected number of calls in which the lines are all attended?

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