College Mathematics
posted by slomomo on .
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 09

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 ? 
it said 9 digits 09

Does this look right if it is 09
26*26*10*10*10*10=6,760,000