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Mathematics, 05.05.2020 03:33 anaikad
In a plan for area codes, the first digit could be any number from 4 through 9, the second digit was either 0 or 4, and the third digit could be any number except 0. With this plan, how many different area codes were possible?
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In a plan for area codes, the first digit could be any number from 4 through 9, the second digit was...
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