A Christmas puzzle: $n$ children in a row identifying the colors of their hats
65883
line of mathematicians guess their own hat color out of c colors
111042
A geometry problem from high school Olympiad selection round
82798
A pattern involving Times
19807
Connected graph with colored edges
42438
Minimizing Gender Regularity in a linear arrangement of boys and girls
150281
Am I on the right track to figure out this combinatorics problem?
126543
Combinatorics problem: $n$ people line up to $m$ clubs
46580
Variation on the Monty Hall Problem
133327
N unlabelled balls in M labeled buckets
125124
Random solving of a Rubik cube .
75804
Is this permutation-sum problem NP-complete?
73622
How to find chromatic number of the $n$-dimensional hypercube $Q_n$?
30625
Does the square or the circle have the greater perimeter? A surprisingly hard problem for high schoolers
102828
Conditional Probability with boys and girls
10724
Case of the 'mice problem' for $n=3$
377
Problem involving many squares and several variables.
69748
Semi-Ambiguous Combinatorics Problem