Twelvetelephones have just been received at an authorized service center. Fourof these telephones are cellular, four are cordless and the other fourare corded phones. Suppose that these components are randomly allocated the numbers 1, 2, ..., 12to establish the order in which they will be serviced. (a) What is the probability that all the cordless phones are among the first fourteen to be serviced? (b) What is the probability that after servicing fourteen of these phones, phones of only two of the three types remain to be serviced?
Home » ⭐️ Mathematics » Twelvetelephones have just been received at an authorized service center. Fourof these telephones are cellular, four are cordless and the other fourare corded phones. Suppose that these components are randomly allocated the numbers 1, 2, ...