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social security numbers

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A nine digit number 2006-03-06
Ryan pose la question :
What is the total number of possible combinations of a nine digit number (ie., social security number) including repeating numbers?
Stephen La Rocque and Penny Nom lui répond.
Social security numbers 2002-09-06
Chris pose la question :
How many different number combinations are there for the social security system? We know that there are only a certain ammount of combinations available and the current US population is at 281 million. The number system should include as many nine digit combinations as possible using the numbers 0-9 in multiple different spots.
Penny Nom lui répond.
Social Security Numbers 1998-07-07
Valerie Lucas pose la question :
How many social security numbers are possible?

the answer is 10^9

why isn't the answer 9^9?
Harley Weston lui répond.

 
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