SOLUTION: The internal telephone numbers in the phone system on a campus consist of five digits with the first digit not equal to zero. How many different numbers can be assigned in this sys

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Question 547217: The internal telephone numbers in the phone system on a campus consist of five digits with the first digit not equal to zero. How many different numbers can be assigned in this system?

i would believe that it would be 9 * 10 * 10 * 10 * 10. but i am not quite sure.
would this question be labeled as combination or permutation?
Answer by mathie123(224) About Me  (Show Source):
You can put this solution on YOUR website!
9%2A10%2A10%2A10%2A10 is correct.
Since order does matter in this case, this is a PERMUTATION.
(A way to remember-- rather than combination locks, they should be called Permutation locks, as the order matters in the code you use to unlock it with. )