Chapter 10 - Section 10.6 - Counting Principles, Permutations, and Combinations - Exercise Set - Page 1103: 35

Total number of different area codes possible were 144.

Work Step by Step

We know that the situation involves making choices with three groups of items. We use the fundamental counting principle to determine the number of different area codes that were possible. And the total number of area codes are given by: $8\times 2\times 9=144$ Hence, there are 144 area codes that are possible.

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