The design of a communication system considered the following questions: (a) How many three-digit phone prefixes that are used to rep- resent a particular geographic area (such as an area code) can be created from the digits 0 through 9? (b) As in part (a), how many three-digit phone prefixes are possible that do not start with 0 or 1, but contain 0 or 1 as the middle digit? (c) How many three-digit phone prefixes are possible in which no digit appears more than once in each prefix?

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A: HERE USE COMBINATION FOR FINDING POSSIBLE NO OF PREFIX WITH GIVEN CONSTRAINTS IN EACH PARTS

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Q: The design of a communication system considered the following questions: (a) How many three-digit…

A: Solution : The complete solution of both the questions is given below in the attachment file.

Q: i How many three-digit phone prefixes that are used to represent a particular geographic area (such…

A: here use combination and permutation

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A: Solution