Trouble Understanding this Combinatorics Problem
38037
A problem with my reasoning in a problem about combinations
43076
Chess tournament combinatorics
108747
A simple permutation question - discrete math
61483
Prove the following identity combinatorially
152911
Stirling numbers combinatorial proof
144025
Number of Solutions in this Number Puzzle
140416
Catalan number - combinatoric
108941
Combinatorics Question Asking How Many Integer Solutions Given Different Restrictions
142477
Closed-form expression for the number of $k$-permutations of length $n$. Duplicates allowed!
23322
Combinatorics Inclusion - Exclusion Principle
144571
A conjecture including binomial coefficients
87431
$n-$circular arrangement problem
134938
Committee combinatorics
71534
Combinatorial explanation for why $n^2 = {n \choose 2} + {n+1 \choose 2}$
134599
How do I do Combinatorics / Counting?
7919
The pigeonhole principle - how to solve questions like that?
29887
Pigeon Hole Principle Problem I'm kind of lost for how to go about this.