← Until recently, all area codes had a 0 or a 1 as the middle digit and the first digit could not be 0 or 1 and the third digit could not be 2. Complete parts (a) and (b) below. (...) (a) How many area codes were possible with this arrangement? How many telephone numbers does the current 9-digit sequence permit per area code? (The first digit that follows the area code cannot start with 0 or 1. Assume that there are no other restrictions.) There are area codes possible. (Type a whole number.)
← Until recently, all area codes had a 0 or a 1 as the middle digit and the first digit could not be 0 or 1 and the third digit could not be 2. Complete parts (a) and (b) below. (...) (a) How many area codes were possible with this arrangement? How many telephone numbers does the current 9-digit sequence permit per area code? (The first digit that follows the area code cannot start with 0 or 1. Assume that there are no other restrictions.) There are area codes possible. (Type a whole number.)
Chapter8: Sequences, Series,and Probability
Section8.6: Counting Principles
Problem 21E: License Plate Numbers In the state of Pennsylvania, each standard automobile license plate number...
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Until recently, all area codes had a 0 or a 1 as the middle digit and the first digit could not be 0 or 1 and the third digit could not be 2. Complete parts (a) and (b) below.
(a) How many area codes were possible with this arrangement? How many telephone numbers does the current 9-digit sequence permit per area code? (The first digit
that follows the area code cannot start with 0 or 1. Assume that there are no other restrictions.)
There are area codes possible.
(Type a whole number.)
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