The phone lines to an airline ticket reservation system are occupied 40% of the time. assume that the events that the lines are occupied on successive calls are independent. (a) if 10 calls are placed, what is the probability that the lines are occupied for exactly 3 calls? (b) if 10 calls are placed, what is the probability that for at least 1 call the lines are not occupied? (c) a person makes 10 calls per day for 365 days in a row. for how many of those days do you expect that all 10 calls got through (i. e., that the lines were not busy for a single call)?