Mathematics, 24.11.2020 20:30 NEUROPHARMACOLOGICAL

Phone numbers consist of a three-digit area code followed by seven digits. If the area code must have a 0 or1 for the second digit, and neither the area code nor the seven-digit number can start with 0 or 1, how many different phone numbers are possible?

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Phone numbers consist of a three-digit area code followed by seven digits. If the area code must hav...

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