combinatorics - How many permutations if no two balls of the same color to be adjacent to each other?
98313
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?
48994
$n$ balls are thrown randomly into $k$ bins - how many are empty?
70327
the numer of partial function between two sets in combinatoric way
134599
How do I do Combinatorics / Counting?
112188
Duplicate Permutations with Tuples
27263
How many ways can $b$ balls be distributed in $c$ containers with no more than $n$ balls in any given container?
142477
Closed-form expression for the number of $k$-permutations of length $n$. Duplicates allowed!
67817
Number of ways to distribute 5 distinguishable balls between 3 kids such that each of them gets at least one ball
133848
Probability that 2 appears at an earlier position than any other even number in a permutation of 1-20
19101
Permutation induced by a partition
24212
proving how many permutations exist.
27141
Combinatorics identity question
34334
Combinatorics Problem with symbols and spaces
107027
Number of combinations and permutations of letters
9971
enumerative combinatorics,In how many ways (as a function of n) can one choose a composition α α of n
86394
EVERGREEN string question. Combinations and permutations
85023
Permutation of n objects with restriction of adjacent pairs