Permutation of alike objects
472
In how many ways can $3$ red, $3$ blue, and $3$ green balls be arranged so that no two balls of the same colour are consecutive (up to symmetry)?
70967
Permutation with prime order, fixed point
98744
How to distinguish between permutation and combination questions?
98850
A positional number system for enumerating fixed-size subsets?
89474
every permutation is either even or odd,but not both
124763
Distinguishing identical particles
107110
Solving Rubik's cube and other permutation puzzles
20636
Algorithm for finding numerical permutation given lexicographic index
64974
How can I generate all permutations / combinations of multiple arrays?
128966
Explicit bijection between $\Bbb R$ and permutations of $\Bbb N$
108943
Combining the second elements of a set of ordered pairs based on their first element
137471
Permutations of a string with duplicate characters
89611
Combinations of selecting $n$ objects with $k$ different types
122389
How can I generate a list of all possible permutations of several letters?
126025
Computing the inverse of a permutation
125811
Recognizing special cases of a defined function for permuted arguments
40852
Number of ways of distributing $n$ identical objects among $r$ groups