SOLUTION: Will we ever run out of combinations of numbers for Social Security?

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Question 241589: Will we ever run out of combinations of numbers for Social Security?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
It's a 9 digit number, 1 billion numbers.
There are 1 billion combinations if 000-00-0000 is allowed.
What is meant by "run out?"