SOLUTION: until recently U.S. telephone area codes were three-digit numbers whose middle digit was 0 or 1.codes whose last two digitsw are 1's are used for other purposes(for example,911).wi

Question 771868: until recently U.S. telephone area codes were three-digit numbers whose middle digit was 0 or 1.codes whose last two digitsw are 1's are used for other purposes(for example,911).with these conditions how many area codes were available?

Answer by oscargut(2103) (Show Source): You can put this solution on YOUR website!
The number of codes with 0 or 1 in the middle are:
10*2*10 = 200
And codes used for other purposes are 10
Then the answer is 200-10 = 190
I can help you with more questions at: mthman@gmail.com
Thanks
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