Asked by Jen

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 :(
Answered by Reiny
in each position you could place 9 different digits.
So the total number of ways = 9^9 = .....
Answered by Jen
9^9 = 387,420,489 different social security numbers are possible??
Answered by Reiny
correct
Answered by Jen
okay great! thanks :)