Counting principles and permutations. A social security number consists of 9 digits. How many different social security numbers are possible if repetition of digits is permitted. digits 0-9

Answer 1

I answered this question for you 20 minutes before you reposted it
http://www.jiskha.com/display.cgi?id=1363627561

What part of my answer did you not understand ?

Answer 2

it said 9 digits 0-9

Answer 3

Does this look right if it is 0-9
26*26*10*10*10*10=6,760,000