SOLUTION: 4 digit number license plates can be made if: the first digit cannot be zero and repetition is allowed.

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Question 1202126: 4 digit number license plates can be made if:
the first digit cannot be zero and repetition is allowed.
Answer by Shin123(626) About Me  (Show Source):
You can put this solution on YOUR website!
There are 9 choices for the first digit, since it can't be zero. For the last 3 digits, there are no restrictions, so there are 10 choices for each of them. In total, there are 9%2A10%2A10%2A10=9000 choices for license plates.