= Combinations = A '''combination''' is an unordered subset. <> ---- == 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. {{attachment:equation.svg}} 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. ---- CategoryRicottone