SOLUTION: how many3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated?

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Question 166200: how many3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated?
Found 2 solutions by checkley77, edjones:
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
9*8*7=504 possible 3 digit numbers without repeats.

Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
9P3=9!/(9-3)!=9*8*7*6!/6!=504