Partitioning a Set
In how many ways can a set of 5 distinct elements be partitioned into any number of nonempty unlabeled blocks?
Related problems & prerequisites
Worth solving first
- Guaranteed Pair Sum 4.0/10
- Making Change 4.0/10
- No Consecutive Elements 4.0/10
Source: Set partitions and Bell numbers, standard material in enumerative combinatorics. Statement written for AxiomIQ.