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2020
Assuming you can use the values listed, and the phone number is 7 digits (e.g. XXX-XXXX), then you can select 3 numbers for the first digit (0 is exempt) then 4 selections for the rest of the digits. So, 3*4*4*4*4*4*4 = 12288 phone numbers.
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Just break apart your numbers or use a calculater.
You write out the numbers. If you just simply put the digit on the paper it will be incorrect.
2020
1958
Assuming you can use the values listed, and the phone number is 7 digits (e.g. XXX-XXXX), then you can select 3 numbers for the first digit (0 is exempt) then 4 selections for the rest of the digits. So, 3*4*4*4*4*4*4 = 12288 phone numbers.
You can use C++ program to decrypt 3 digit number
According to Ripon College Style Guide... For telephone numbers, use "ext." followed by a space and the four-digit number.
65390,93650,69530,
use the digit 1234to make two different numbers
oo..this one is very hard.
Fax number looks the same as any regular phone number it contains area code+7 digit number (800-123-4567)
9
18 of them
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