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The number of telephone lines busy at an instant of time is a binomial variate with a probability of 0.2. If 10 lines are selected

The number of telephone lines busy at an instant of time is a binomial variate with a probability of 0.2. If 10 lines are selected at random, nd the probability that a) Exactly 5 lines are busy. b) At most 2 lines are busy. and c) All lines are busy

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