What's the term to describe this combination?
- by developer.cyrus
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?
1 2 3 4
1 2 3
1 2 4
2 3 4
1 2
1 3
1 4
2 3
2 4
3 4
1
2
3
4