In how many ways can I distribute 5 distinguishable balls into 4 distinguishable boxes such that no box is left empty.
61
Calculating the total number of surjective functions
115717
In how many ways can 4 unlabeled blue balls and 2 unlabeled red balls be packed in 5 different boxes?
107614
Partitioning an infinite set
4041
Claims and questions regarding $n$-ball distribution?
96086
Double Factorial: Number of possibilities to partition a set of $2n$ items into $n$ pairs
141740
Different ways of Arranging balls in boxes
46913
How to distribute objects evenly?
45074
Combinatorics: Selecting objects arranged in a circle
84917
Four balls with different colors in a box, how many times do I need to pick to see all four colors?
153651
Countable partition in atoms
82329
Probability : balls from boxes
16705
product distribution of two uniform distribution, what about 3 or more
133327
N unlabelled balls in M labeled buckets
22454
How many combinations can I make?
14046
Problem about a process with bins of balls
43076
Chess tournament combinatorics
111609
Each $2\times 5$ rectangle contains $1\times 3$ rectangle