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?
Answers
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
if anything goes ......
number of possible phone numbers = 10^10 or 10 Billion
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