Homework Help: College Mathematics

Posted by slomomo on Monday, March 18, 2013 at 1:26pm.

Counting Principles and Permutation. A social security number consists of 9 digits. How many different social security numbers are possible if repetition of digits is permitted

College Mathematics - Reiny, Monday, March 18, 2013 at 1:51pm
If the lead digit can be a zero
then 10^9
If the lead digit cannot be a zero
then 9(10^8)
College Mathematics - Reiny, Monday, March 18, 2013 at 1:52pm
If the lead digit can be a zero
then 10^9
If the lead digit cannot be a zero
then 9(10^8)

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