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# Combinations

A combination of a set of distinct object is an unordered arrangement of these objects.

For a set of $$n$$ items, thre is only one possible combination.

## k-combinations

To choose $$k$$ elements from a wider group on $$n$$ an k-combination may be used.

For two integers $$n, k$$ where $$0 \leq k \leq n$$ possible combinations are: $C(n,k) = \frac{n!}{r!(n-k)!}$