New posts in permutations

Distributing $n$ different things among $r$ distinct groups such that all of them must get atleast $1$

combinatorics permutations combinations

Literature on group theory of Rubik's Cube

abstract-algebra group-theory finite-groups permutations rubiks-cube

Number of ways you can form pairs with a group of people when certain people cannot be paired with each other.

combinatorics permutations

Subgroups between $S_n$ and $S_{n+1}$

group-theory permutations

Group of $r$ people at least three people have the same birthday?

probability combinatorics permutations birthday

Why is $\sum_{p \in S_n} 2^{c(p)}$ equal to $(n+1)!$?

combinatorics permutations

What is the Probability of someone meeting a person they know on a train?

probability combinatorics permutations recreational-mathematics conditional-probability

Permutations with global limited repetition without the need for providing digits' specific repetitions

combinatorics permutations

Counting in a rectangular grid with obstacles

permutations

Independence number of a graph based on $k$-permutations of $n$

graph-theory permutations

Prove by Double Counting Method $\sum\limits_{k = 0}^m \binom{m}{k}\binom{n}{r + k} = \binom{m + n}{m + r}$ [duplicate]

combinatorics summation permutations binomial-coefficients combinatorial-proofs

Catalan numbers: bijection between applications of a binary operator and Dyck words.

sequences-and-series combinatorics permutations combinatorial-proofs catalan-numbers

How many different/unique $4$-letter arrangements are there of the letters in the word Mississauga?

combinatorics permutations

A permutation is a product of disjoint transpositions iff its order is $1$ or $2$

abstract-algebra permutations

Please explain definition of determinant using permutations?

linear-algebra permutations determinant

Factorial of 0 - a convenience? [duplicate]

permutations factorial

Rearrangements that never change the value of a sum

sequences-and-series permutations conditional-convergence

Count permutations of $\{1,2,...,7\}$ without 4 consecutive numbers - is there a smart, elegant way to do this?

discrete-mathematics permutations inclusion-exclusion

recurrence involving permutations

combinatorics elementary-set-theory permutations recurrence-relations

Number of bitstrings with $000$ as substring

combinatorics induction permutations fibonacci-numbers