SOLUTION: 1) How many phone numbers in Chicago can have the area code 312? I am stuck on this problem. I figure that there are 10 numbers from 0 to 9 and that 0 and 1 are not used at all

Question 93418: 1) How many phone numbers in Chicago can have the area code 312?
I am stuck on this problem. I figure that there are 10 numbers from 0 to 9 and that 0 and 1 are not used at all, therefore, this leaves 8 digits. This is as far as I have gotten.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
1) How many phone numbers in Chicago can have the area code 312?
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If 0 and 1 are not used you have 8^7 numbers = 2,097,152
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If 0 and 1 are used you have 10^7 = 10,000,000
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Chicago would probably need the larger number.
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Cheers,
Stan H.
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