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
4-digit phone numbers were used in the early days of telephone systems, particularly in the mid-20th century. In the United States, 4-digit phone numbers were common in the 1940s and 1950s before transitioning to 7-digit numbers. The exact year when 4-digit phone numbers were phased out varied by location and telephone company.
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.
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18 of them
9