Question

How many phone numbers can be made if all the digits (that is, 10 digits) need to be filled in and any single digit number (0-9) can be used for any digit?
I don't think any area codes in The US or Canada start with 0 or 1, but ...
if anything goes ......

number of possible phone numbers = 10^10 or 10 Billion

Related Questions

1. a door code is made up of six unique digits the last digit is 8. 2.oddd and even digits alternat... A security code used to consist of two odd digits, followed by four even digits. To allow more codes... You pick 2 digits (0-9) at random without replacement, and write them in the order picked. What i... kenndra was able to calculate the total number of 3-digits numbers that can be formed from a given s...