SOLUTION: The Phone Number Problem:My office phone is 270-809-6219.If the first number of the phone number cannot be zero how many possible numbers are there?

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Question 442718: The Phone Number Problem:My office phone is 270-809-6219.If the first number of the phone number cannot be zero how many possible numbers are there?
Answer by swincher4391(1107) About Me  (Show Source):
You can put this solution on YOUR website!
First of all, wow... you must live pretty close to me. Same area code.
To your question:
If your first number can't be 0, then you only have 9 possible numbers, (1-9).
The other 9 numbers, you can use all 10 numbers.
So 9 * 10^9 = 9,000,000,000 or 9 billion.