Asked by Jen

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??
Answered by Ms. Sue
http://www.jiskha.com/display.cgi?id=1311437782

Answered by Jen
Ms. Sue, wouldn't it be 9^10? I think 0 wasn't included, so it would be 10 numbers not 9.....right???
Answered by Ms. Sue
I'm not sure.

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


Answered by PsyDAG
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)
Answered by Jen
so it would be 1,000,000,000???
Answered by Lady baby
But how about if repetition of digits are NOT allowed??
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