In how many ways Rdistinct balls can be placed in M distinct cells?
57137
Multichoosing (Stars and bars)
6432
How many ways can N elements be partitioned into subsets of size K?
110638
Polygon with balls as corners
150468
Example of two open balls such that the one with the smaller radius contains the one with the larger radius.
153651
Countable partition in atoms
139913
In how many ways can $5$ balls of different colours be placed in $3$ boxes of different sizes if no box remains empty?
8173
Number of ways to choose $n$ balls from $3n$ balls, distinguishable/indistinguishable.
141740
Different ways of Arranging balls in boxes
85127
Fill particles in a container
23322
Combinatorics Inclusion - Exclusion Principle
37115
another balls and bins question
85650
Number or regions formed when $n$ points on a circle are joined
56509
What is the correct way to think about this yet another balls/boxes problem?
25457
FreeCell: How many cards can be moved at once?
53179
Combinations, when placing n objects into k boxes, each box has its own size and the order in them doesn't matter?
4301
How many different arrangements?
31604
Why are empty and non empty TikZ matrix cells not equally placed?