SOLUTION: the permutation of 15 things taken 5 at at time?

SOLUTION: the permutation of 15 things taken 5 at at time?

Algebra.Com

Question 290370: the permutation of 15 things taken 5 at at time?
Answer by brucewill(101) (Show Source): You can put this solution on YOUR website!
This and the next question are very similar.
Permutations would be:

Combinations would be:

From here, I assume you can do the arithmetic?
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