SOLUTION: How do I solve the following problem? Evaluate P(7,3). Thanks for your help.

Question 224816: How do I solve the following problem?
Evaluate P(7,3).
Thanks for your help.
Answer by LtAurora(115) (Show Source): You can put this solution on YOUR website!
The equation for P is , which is used to order a collection of n elements taken at r time.
The n in our case is 7, and the r is 3.
So, we have the number of permutations of 7 taken 3 at a time.
P(7,3)=
This gives us:
The cancel to leave us with:

Which is: 840
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