SOLUTION: How can you use nCr? What are its difference from nPr?

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Question 575591: How can you use nCr? What are its difference from nPr?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How can you use nCr? What are its difference from nPr?
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That's a relatively long story.
Please use Google to search for "statistics combinations permutations".
Cheers,
Stan H.