A puzzle based on combinatorics, which is the study of counting discrete structures. Use with [mathematics]
A puzzle based on combinatorics, which is the study of counting discrete structures.
For example, how many ways to arrange $3$ of $abcd$, where order is important?
We have $abc,abd,acd,bcd$ and six of each (for example $abc,acb,bac,bca,cab,cba$), and so the answer is $24$.
For basic combinatoric examples and explanations, see:
Puzzles where permutations, sets, graphs, lattices and other combinatorial mathematics feature prominently should include this tag.