Question
In a different plan for area codes, the first digit could be any number from 3 through 7, the second digit was either 5,6,0r 7,
In a different plan for area codes, the first digit could be any number from 3 through 7, the second digit was either 5,6,0r 7, and the third digit could be any number except 6,8, and 9 With this plan, how many different area codes are possible?
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Practical Linear Algebra A Geometry Toolbox
Authors: Gerald Farin, Dianne Hansford
3rd Edition
1466579587, 9781466579583
