Posted by **Jen** on Saturday, July 23, 2011 at 12:16pm.

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

Oh goodness, I'm not sure what number to start with :(

- Math -
**Reiny**, Saturday, July 23, 2011 at 12:37pm
in each position you could place 9 different digits.

So the total number of ways = 9^9 = .....

- Math -
**Jen**, Saturday, July 23, 2011 at 12:54pm
9^9 = 387,420,489 different social security numbers are possible??

- Math -
**Reiny**, Saturday, July 23, 2011 at 5:15pm
correct

- Math -
**Jen**, Saturday, July 23, 2011 at 5:27pm
okay great! thanks :)

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