Question: Please explain this? In a different plan for area codes, the first digit could be any number from 1 through 4, the second digit was

Please explain this?

In a different plan for area codes, the first digit could be any number from 1 through 4, the second digit was either 4 or 5, and the third digit could be any number except 2, 6, or 9 With this plan, how many different area codes are possible? There are possible area codes
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