Telephone numbers are preceded by a 3 digit area code (e g 514) In the following questions, any digit from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 can be used unless otherwise stated How many area codes are possible if the third digit must not be 7 the digit 6 must not be used all three digits must be the same e g 8 8 8 the first digit cannot be 0 or 1 , the second digit cannot be 6 or 8 , and the third digit must be 8

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Question: Telephone numbers are preceded by a 3 -digit area code (e.g. 514). In the following questions, any digit from {0, 1, 2, 3, 4, 5,

Telephone numbers are preceded by a 3-digit area code (e.g. 514). In the following questions, any digit from {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} can be used unless otherwise stated. How many area codes are possible if:

the third digit must not be 7?
the digit 6 must not be used?
all three digits must be the same? e.g. 8-8-8
the first digit cannot be 0 or 1, the second digit cannot be 6 or 8, and the third digit must be 8?

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