At a party $n$ people toss their hats into a pile in a closet.$\dots$
111297
Question on the 'Hat check' problem
140806
How do I tackle this combinatorics problem about married couples around a table?
65764
Partitioning $\{1,2,\ldots,k\}$ into $p$ subsets with equal sums, where $p$ is prime
155755
How many ways can you divide $9$ students into three unlabeled teams of $4$, $3$, and $2$ people?
63571
The Mississipi counting problem, this time in circle
25843
Winter Bash 2015 Secret Hats
82025
The Probability $P_{[m]}$ that exactly $m$ among the $N$ events $A_1,\dots,A_N$ occur simultaneously
54351
Probability of throwing balls into bins
40852
Number of ways of distributing $n$ identical objects among $r$ groups
85127
Fill particles in a container
50781
$(n+1)$th prime $p_{n+1}$ less than or equal to $p_1p_2\dots p_n+1$
18141
Embedding $S_n$ into $A_{n+2}$
126543
Combinatorics problem: $n$ people line up to $m$ clubs
104700
suppose $n$ people are in a party and every two of them have exactly one common friends,prove that there is one who is friend to all.
10303
Difference of the \dots*
147861
Packing squares into a circle
57986
Sum of products of combinatorials