Combination problem: retrieve four kinds of objects with restriction
89611
Combinations of selecting $n$ objects with $k$ different types
140858
Number of ways to choose 6 objects when they are of 11 different kinds
18788
Derangements of multisets
145102
Selecting A combination of minimum cost
132009
Combination of List>
377
Problem involving many squares and several variables.
73794
counting with max and min restrictions
149010
Finding Combinations to the provided Sum value
41365
Choice function for collection of arbitrary finite sets. AC required?
104603
Integer program in which at least one of three inequalities holds
1627
Cartesian product of an arbitrary number of sets
89506
Union of disjoint sets : Equivalence relations
77171
How to find unique multisets of n naturals of a given domain and their numbers?
107964
Simple combinatorics problem.
20973
How can I find all the subsets of a set, with exactly n elements?
68882
Path to Combinatorics Problem [$1.11$]
8049
Generating Combinations