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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