Stars and bars (combinatorics)
Graphical aid for deriving some concepts in combinatorics / From Wikipedia, the free encyclopedia
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In the context of combinatorial mathematics, stars and bars (also called "sticks and stones",[1] "balls and bars",[2] and "dots and dividers"[3]) is a graphical aid for deriving certain combinatorial theorems. It can be used to solve many simple counting problems, such as how many ways there are to put n indistinguishable balls into k distinguishable bins.[4]