How many numbers are in a zeevex code?
I'm pretty sure that there can be at least 10
How many seven digit telephone numbers are possible if the first number is not allowed to be 0 or 1?
8,000,000 million telephone numbers are possible with these conditions, corresponding to the numbers 2,000,000 - 9,999,999. Many countries have forced dialing of the area code now, creating telephone numbers with a minimum of 10 digits. This means there are 8 million possible telephone numbers in each area code. (area code of 3 digits long).
It depends which country you're in. In the UK, numbers usually have either a 4-digit code with seven digits, or 5-digit code plus six digits. Therefore - theoretically, those with a 4-digit code can have up to 9,999,999 numbers allocated to it. those with 5-digits could have up to 999,999 numbers. In practice, however - this rarely happens !
Each area code in the US and Canada has a theoretical capacity of slightly less than 8 million numbers. The first digit after the area code cannot be 0 or 1, and the second and third digits cannot be 11, plus a few other miscellaneous restrictions. However, since area code 954 is in an overlay with area code 754, Broward County, Florida, has a theoretical capacity of over 15 million numbers!