Find the number of ways to choose a countable subset of R
95747
Number of countable subsets of $\mathbb{R}$
130514
best way to pick a random subset from a collection?
76381
Plain integer partitions of $n$ using $r$ parts
115954
how to find maximal linearly independent subsets
45448
Minimum number of $k$-partitions of a set of size $n$ to enumerate all $n \choose k$ combinations
82207
Number of Pairs of Subsets
98850
A positional number system for enumerating fixed-size subsets?
41192
Neatest proof that set of finite subsets is countable?
79974
The cardinality of Lebesgue sets
127678
A partition of the unit interval into uncountably many dense uncountable subsets
129205
A question about uncountable, dense sets in R
8173
Number of ways to choose $n$ balls from $3n$ balls, distinguishable/indistinguishable.
99599
Uncountable and countable
39880
Cardinality of Orderings of $\mathbb{R}$
110856
Number of ways to select $K$ people from $N$ people such that at least $r$ people are there in between them
108807
Subset of a cartesian product
88079
R has an uncountable number of distinct dense subsets.