## College Algebra (6th Edition)

Number of different area codes possible = 8$\times$2$\times$9 = 144
The first digit could be any number from 2 through 9, then the number of ways to express first digit = 8 The second digit is either 0 or 1, then the number of way to express second digit = 2 The third digit could be any number except 0, then the number of way to express third digit = 9 Number of different area codes possible = 8$\times$2$\times$9 = 144