Question

Social Security: Find the number of possible 9-digit social security numbers if the digits may be repeated.

Answer 1

10^9

Answer 2

this question is a permutation so if there are 9 digits then to find answer you need to do
10*10*10*10*10*10*10*10*10

Answer 3

10 digits is he reason for the 10

Answer 4

That is, you have 10 choices for the first 'slot', [0-9], and the next choices are non dependent on the previous, so you have 10 for the next 9. 10 * 10 * ... = 10^9

Answer 5

thank you guys!!!!!

Answer 6

It's a simple permutation.