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

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Question 290370: the permutation of 15 things taken 5 at at time?
Answer by brucewill(101) About Me  (Show Source):
You can put this solution on YOUR website!
This and the next question are very similar.
Permutations would be:
15%21+%2F+5%21
Combinations would be:
15%21+%2F+10%21+5%21
From here, I assume you can do the arithmetic?