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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
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A telephone company wants to create as many 7-digit phone numbers as possible without changing the first 3 digits How many phone numbers can be created?
10,000
How many different 7 digit phone numbers are possible if the first digit cannot be 0 or 1?
hi wazup hi wazup
How many 7 digit phone numbers can be formed if all the numbers can be repeated?
823543
How many four digit numbers are possible from the digit 0'1'2'3'4 numbers may be repeated?
625 if numbers can have leading 0s, 500 otherwise.
How many three digit even numbers are possible if the left digit cannot be zero?
450
How many 4 digit numbers are possible with no two numbers being adjacent?
There are 2941 4-digit numbers such no two of its digits differ by 1.
How many 4 digit numbers are possible by 9 and 6?
There are 16 4-digit numbers that can be made up from 9 and 6.
How many three digit numbers are there?
There are 900 three digit numbers. (99 - 1000) (# of possible numbers in the first position = 9) (# of possible numbers in the second position = 10) (# of possible numbers in the third position = 10) 9 *10 *10 = 900
How many 4 digit numbers can be formed from the digits 12345?
The first digit can have 5 possible numbers, the second digit can have 4, the third 3, the fourth 2. 5
How many five-digit numbers can you make with 0 1 2?
Not sure what a "didget" is. It is possible to make 18 5-digit numbers.
How many different 2 digit numbers can be formed from the digits 2 6 7 and 8?
Without repeats there are 4 × 3 = 12 possible 2 digit numbers. With repeats there are 4 × 4 = 16 possible 2 digit numbers.
How many 5 digit numbers are there with distinct digits?
There are 30,240 different 5-digit numbers. Math: 10*9*8*7*6 1st digit has 10 possible choices (0-9) 2nd digit has 9 possible choices (one of the digits was used in the 1st digit) 3rd digit has 8 possible choices 4th digit has 7 possible choices 5th digit has 6 possible choices
