SOLUTION: how many ways can 3 books be placed on a shelf if chosen from a selection of 7 different books?

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Question 332309: how many ways can 3 books be placed on a shelf if chosen from a selection of 7 different books?
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
Use nPr = n!/(n-r)!
Let n = 7
Let r = 3
7P3 = 7!/(7-3)!
7P3 = 5040/4!
7P3 = 5040/24
7P3 = 210
There are 210 ways or permutations.