SOLUTION: How many different 5-digit zip codes are there if no digit is repeated?

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Question 621174: How many different 5-digit zip codes are there if no digit is repeated?
Answer by Alan3354(69443) About Me  (Show Source):
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How many different 5-digit zip codes are there if no digit is repeated?
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The 1st digit can be 1 of 10.
Then 1 or 9, 1 of 8, etc
--> 10*9*8*7*6