What's the term to describe this combination?

Posted by developer.cyrus on Stack Overflow See other posts from Stack Overflow or by developer.cyrus
Published on 2010-05-28T06:47:34Z Indexed on 2010/05/28 6:51 UTC
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algorithm

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programming-languages

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theory

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probability

There are 4 items: 1, 2, 3, and 4. If we just allow the following combinations, what should we call them? I forgot it. Is it called nCr?

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