Area codes are the first three digits of a 10-digit telephone number. The first digit of an area code cannot be 0 or 1. a. How many area codes can be created if digits are allowed to be repeated? b. How

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asked Nov 2, 2022 154k views

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Area codes are the first three digits of a 10-digit telephone number. The first digit of an area code cannot be 0 or 1.

a. How many area codes can be created if digits are allowed to be repeated?

b. How many area codes can be created if digits are not allowed to be repeated?