SOLUTION: how many combinations can u arrange 7 books on a shelf

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Question 267348: how many combinations can u arrange 7 books on a shelf
Found 2 solutions by sk218, Alan3354:
Answer by sk218(1) About Me  (Show Source):
You can put this solution on YOUR website!
7x7=49
49 different ways

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
The 1st is 1 of 7
The 2nd is 1 of 6
etc
--> 7*6*5*4*3*2*1
= 5,040
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That's 7! "7 factorial"