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Combinations
A combination is an unordered subset.
Contents
Counting
The number of possible combinations depends on the size of the starting set and the number taken from it. These are notated as n and k respectively.
![[ATTACH]](/Analysis/Combinatorics?action=AttachFile&do=upload_form&target=equation.svg&ticket=006a97ed51.0034e218a8cb4c37e75970ed676f32e1f334adfd "[ATTACH]"){kind=small}
Intuitively, there are 3 ways to take 2 from a set of 3. (A and B; B and C; A and C.) Plugging n=3 and k=2 into the equation also yields the expected result.