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Mathematics 16 Online
OpenStudy (anonymous):

• The second digit and third digit cannot both equal 1 since these values are designated for other purposes such as 911 (emergency) and 411 (information), and • 555-0100 through 555-0199 are reserved for fictional uses such as in television shows or movies. According to these conditions, how many 7-digit numbers are possible in a single area code?

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