Expected number of siblings in a family
100495
Expected number of siblings, given the expectation of children in a family
88141
A family of events such that all proper subfamilies are independent, but the entire family is not
136449
Combinatorics problem on $20$ people, $12$ months, and distinguishable groups
26115
Probability of Birthdays
83736
The probability that no person has the same birthday month
65163
Expected number of runs in a sequence of coin flips
144821
Number of ordered pairs of subsets
118293
Strategy for determining the number of homomorphisms between two Groups
100832
Number of binary trees with $N$ nodes
14678
Free Throw Probability and Expected Number of Points
67817
Number of ways to distribute 5 distinguishable balls between 3 kids such that each of them gets at least one ball
142144
Countable or uncountable; family of disjoint triangles?
73544
Expected Number of Flips for a Sequence of 4 to Repeat
123137
Recursion: putting people into groups of 1 or 2
89544
Expectation of a random variable that takes points in the natural numbers
119231
Number of Atoms in a Probability Space
44013
How many trees over ${1,2,3,...n}$ with conditions