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OpenStudy (anonymous):
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? How did you come up with your answer?
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OpenStudy (campbell_st):
well just list your options |dw:1401825177858:dw|
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