New posts in permutations

How many arrangements of $\{a,2b,3c,4d, 5e\}$ have no identical consecutive letters?

combinatorics permutations

Solving Rubik's cube and other permutation puzzles

group-theory permutations puzzle rubiks-cube

How many ways are there to fill a 3 × 3 grid with 0s and 1s?

combinatorics permutations isometry

In how many permutations of $\{A,B,C,D,E,a,b,c,d,e\}$ does $A$ always come before all lowercase letters?

combinatorics permutations

Rearrangement of groups such that no two members meet again

combinatorics permutations

Bernoulli Numbers and Tangent numbers.

sequences-and-series combinatorics permutations power-series generating-functions

Number of zeroes at end of factorial

permutations factorial

Putting socks and shoes on a spider

combinatorics discrete-mathematics solution-verification permutations contest-math

Counting necklace with no adjacent beads are of the same color

combinatorics permutations necklace-and-bracelets

Six digit number combinatorics problem

combinatorics permutations

Does a homomorphic image of even permutations consist of even permutations?

abstract-algebra group-theory permutations

Number of possible permutations of n1 1's, n2 2's, n3 3's, n4 4's such that no two adjacent elements are same?

sequences-and-series combinatorics permutations

Intuitive explanation of binomial coefficient

combinatorics permutations binomial-coefficients

Find the subgroups of A4

abstract-algebra finite-groups permutations cyclic-groups

Derangement formula for repeated permutation

combinatorics permutations derangements

how many ways can the letters in ARRANGEMENT can be arranged [closed]

permutations

Stuck on specific argument in the proof of O'Nan-Scott-Aschbacher theorem

group-theory permutations finite-groups proof-explanation

How many ways are there for 8 men and 5 women to stand in a line so that no two women stand next to each other?

combinatorics permutations

Doing a magic trick with limited memory (from a problem solving course)

group-theory permutations contest-math puzzle

Centralizer of a given element in $S_n$?

abstract-algebra group-theory permutations