All phone numbers consist of a three-digit area code, a three-digit exchange, and then a four-digit number. A town uses the 587 area code and the exchange 355. How many different phone numbers are possible in this town under the follow conditions?
1 Answer
Jul 31, 2016
Explanation:
The Area Code can be selected in only
The Exchange Code can be selected in
After these two selection, a
that the First such No. can not be
The Second, Third and Fourth No. can each be selected in
ways.
Therefore, total no. of ways of selection