Question: II. Not too long ago, a. an area code had to have a 0 or 1 in the middle digit. With this additional rule, 1.

II. Not too long ago, a. an area code had to

II. Not too long ago, a. an area code had to have a 0 or 1 in the middle digit. With this additional rule, 1. how many area codes were possible? 2. How many 10-digit phone numbers were possible

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