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In a different plan for area​ codes, the first digit could be any number from 4 through 7​, the second digit was either 2, 3, or 4​, and the third digit could be any number except 0 . With this​ plan,
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In a different plan for area​ codes, the first digit could be any number from 4 through 7​, the second digit was either 2, 3, or 4​, and the third digit could be any number except 0 . With this​ plan, how many different area codes are​ possible?

User Robynne
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1st digit:: 3ways
2nd digit:: 3ways
3rd digit:: 9 ways

3x3x9=81

So the answer is 81 different possible area codes.
User MobyDX
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