In how many ways can $m$ employees be assigned to $n$ projects if every project is assigned to at least one employee?
61
Calculating the total number of surjective functions
91351
the number of components working at a particular time
40852
Number of ways of distributing $n$ identical objects among $r$ groups
68882
Path to Combinatorics Problem [$1.11$]
75804
Is this permutation-sum problem NP-complete?
6432
How many ways can N elements be partitioned into subsets of size K?
44013
How many trees over ${1,2,3,...n}$ with conditions
59831
How to relate combinatorial proof to bipartite graphs?
142718
How can I find the smallest set of groups of $n$ elements such that every element is in the same group as every other at least once?
133436
Inclusion-Exclusion: INTELLIGENT permutations
104603
Integer program in which at least one of three inequalities holds
66842
Number of $n^2\times n^2$ permutation matrices with a 1 in each $n\times n$ subgrid
89611
Combinations of selecting $n$ objects with $k$ different types
38037
A problem with my reasoning in a problem about combinations
132726
Viable design for multiple batch jobs
100832
Number of binary trees with $N$ nodes
3479
How to count the no. of distinct ways in which $1,2,...,6$ can be assigned to $6$ faces of a cube?