. Fifteen telephones have just been received at an authorizedservice center. Five of

Chapter 2, Problem 39

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. Fifteen telephones have just been received at an authorizedservice center. Five of these telephones are cellular, fiveare cordless, and the other five are corded phones. Supposethat these components are randomly allocated the numbers1, 2, . . . , 15 to establish the order in which they will beserviced.a. What is the probability that all the cordless phones areamong the first ten to be serviced?b. What is the probability that after servicing ten of thesephones, phones of only two of the three types remain tobe serviced?c. What is the probability that two phones of each type areamong the first six serviced?

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