SOLUTION: A reading list for a course contains 20 articles. How many ways are there to choose 3 articles from this list?

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Question 877153: A reading list for a course contains 20 articles. How many ways are there to choose 3 articles from this list?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
There are 20*19*18 = 6,840 ways to choose 3 articles assuming order matters.

If order does not matter, then there are 6840/(3!) = 6840/6 = 1,140 ways to choose 3 articles.