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Mathematics, 29.07.2020 21:01 oofoofoof1

In a different plan for area codes the first digit could be any number from 3 through 6 the second digit was either 5,6,7 or 8 and the third digit could be any number except 5. With this plan how many different area codes are possible?

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In a different plan for area codes the first digit could be any number from 3 through 6 the second d...

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