Subset of a multiset with limited repetition {1,1,1,2,2,2,3} or {3,3,4,4,5,5,7,7,7}
120748
Combination With Finite Replacements
98850
A positional number system for enumerating fixed-size subsets?
124060
Are these subsets of the powerset P(N) countable?
30585
Picking a random element from a set
135743
Collection of subset generating every pairs of elements
117658
A set with n elements has 2^n subsets
108275
How do I count the subsets of a set whose number of elements is divisible by 3? 4?
60309
Let X be a subset of {1,2,...,2014}...
56370
Associative operation on a set $S$
5448
Finding the closure of some subsets of the ordered square
62175
A general formula for $n$ distinguishable arrangements of length $\ell$ of a sequence of a given size?
132605
Finding the number of subsets of a set such that an element divides the succeeding element.
69748
Semi-Ambiguous Combinatorics Problem
30968
Is it possible that every set can be specified?
6679
Counting number of subsets which contain a specific element
158671
Cardinality of a set that consists of all existing cardinalities
96086
Double Factorial: Number of possibilities to partition a set of $2n$ items into $n$ pairs