Math
posted 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??


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

I'm not sure.
Please post this as a New Question. That way a math tutor may be able to help you. 
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) 
so it would be 1,000,000,000???