Posted by **Jen** on Tuesday, July 26, 2011 at 4:09pm.

Social Security Numbers A social security number consists of nine digits. How many different social security numbers are possible if repetition of digits is permitted?

Is it 9^10??

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**Ms. Sue**, Tuesday, July 26, 2011 at 4:27pm
http://www.jiskha.com/display.cgi?id=1311437782

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**Jen**, Tuesday, July 26, 2011 at 4:47pm
Ms. Sue, wouldn't it be 9^10? I think 0 wasn't included, so it would be 10 numbers not 9.....right???

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**Ms. Sue**, Tuesday, July 26, 2011 at 5:03pm
I'm not sure.

Please post this as a New Question. That way a math tutor may be able to help you.

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**PsyDAG**, Wednesday, July 27, 2011 at 10:49am
For social security numbers, 0 can be included.

n^r = 10^9, where n is the number of things to choose from, and you choose r of them (Repetition allowed, order matters)

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**Jen**, Wednesday, July 27, 2011 at 12:49pm
so it would be 1,000,000,000???

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