Phone Numbers Current rules for telephone area codes allow the us... | Study Prep in Pearson

phone numbers current rules for telephone area codes allow the use of digits 29 for the first digit and 09 for the second and third digits how many different area codes are possible with the 91384

Express all probabilities as fractions. Current rules for telephone area codes allow the use of digits 2-9 for the first digit, and 0-9 for the second and third digits. How many different area codes are possible with these rules? That same rule applies to the exchange numbers, which are the three digits immediately preceding the last four digits of a phone number. Given both of those rules, how many 10 -digit phone numbers are possible? Given that these rules apply to the United States and Cana

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