Math
posted by Jen on .
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 :(
posted by Jen on .
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 :(