8*10*10*10*10*10*10 = 8000000
If this is a UK question, don't forget that numbers beginning 999 are also not issued, in fact usually 990 to 999 are not issued.
This reduces the figure to 7 900 000 or so.
hi wazup hi wazup
The mean of 2, 4, 6 and 8 is 5. In this case, the mean is the same as the average because there are 4 distinct values with a sum of 20.
Looks like a phone number to me.Looks like a phone number to me.Looks like a phone number to me.Looks like a phone number to me.
he was ironing when the phone rang.
I keep getting phone calls for the pizzeria because so many people transpose some digits of their phone number.
hi wazup hi wazup
10,000
Without restrictions, it was would numbers 000-000-0000 through 999-999-9999. So that would be 9,999,999,999 + 1 = 10 billion different 10-digit phone numbers. Ex: If there existed single digit phone numbers, there would be 10, because the digits are 0 through 9. If there existed only double digit phone numbers, then it would be 00 through 99 which would be 100 total two-digit numbers. Therefore the total possible combinations for an X digit phone number would be: 10^X
The first digit: 6
There are 10 possible numbers that can be chosen. Since the first digit can't be 0, there are 9 selections for the first digit. The second number can include a 0, but can't include the first number chosen, so there are 9 selections for the second digit. Then there are 8 digits for the next number, 7 digits for the next number, and so on. Total telephone numbers are: 9*9*8*7*6*5*4 = 544320 phone numbers.
9*106 or 9 million.
10 digit numbers
Using your rule - essentially, it's the simplified sum of 9999999-2000000 which is a total of 7999999 numbers !
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.
In the 1940s, phone numbers typically consisted of a three-digit area code followed by a seven-digit local number, such as "ABC-1234." This format differed from modern phone numbers, which generally have a three-digit area code followed by a seven-digit local number, such as "(123) 456-7890."
7
Phone numbers vary by carrier. The type is typically a three digit area code numbers 0-9 first then the location numbers that are typically seven digits 0-9. Once a call is places the phone will ring.