SOLUTION: In a small city there are different exchanges possible for each 7-digit telephone number. The exchange is the first 3 digits of the telephone number. Each of the last 4 digits can
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Question 1156994: In a small city there are different exchanges possible for each 7-digit telephone number. The exchange is the first 3 digits of the telephone number. Each of the last 4 digits can be any integer from 0 to 9. How many telephone numbers are possible in the town? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website!
The 1st number would be
( exchange ) - 0 0 0 0
The last number would be
( exchange ) - 9 9 9 9
