find the number of ways to write a word of length k over an n-letter alphabet so that the word uses every letter at least once?
44540
How many strings contain every letter of the alphabet?
118090
Generating all permutations of a given string
61372
Numbering exceeding the 26 letter alphabet
132883
How many words of length W can be made using an alphabet with L letters.
118674
Simple upper bound for $\binom{n}{k}$
80744
What is the number of strings at size $n$ that is constructed from ${a,b,c,d}$ and there is an even num of $a$
32508
how many ways can the letters in ARRANGEMENT can be arranged
87664
Combination of $n$ letter out of $3n$.
65763
Number of ways to write n as a sum of k nonnegative integers
90293
How expand Binomial[n, k] for k >= 6?
38809
In how many ways can the letters of word $PERMUTATIONS$ be arranged if there are always 4 letters between P and S?
130614
Permutations on word $MISSISSIPPI$.
86480
Is the set of all finite sequences of letters of Latin alphabet countable/uncountable? How to prove either?
9349
In how many ways can the letters of the word CHROMATIC be arranged?
116715
How to repeat each of the individual letters in a piece of text? in Java
111379
Creating all possible k combinations of n items in C++
826
What is the number of ways to select ten distinct letters from the alphabet $\{a, b, c, \ldots, z\}$, if no two consecutive letters can be selected?