No. of ways in which n letters can be put in n envelopes such that none is in the right one
13190
Rearranging people so that no one is in the same spot
158285
How to solve this combinatorial problem about selecting letters from different groups?
48904
Opposite of Alternatives
147745
Sentence case in a message
18243
Number of occurences of letters in a word?
135790
How can I insert a character after every n characters in javascript?
23547
Aligning letters "Wrong" appears more "Right"
71504
Leave newlines intact in bounty messages
88410
Enumerate paragraphs and subparagraphs like sections but with letters
97878
Are there uncountably many surjections from $\mathbb N$ to $\mathbb N$?
113242
How many ways can you create a password of 10 characters long that has at least one lowercase letter (a-z) and at least one number ($0-9$)?
3195
Is adding a parallel word that only intersects the end letter of an existing word allowed in Scrabble?
46033
What corrections can you make on galley proofs?
122389
How can I generate a list of all possible permutations of several letters?
12046
No. of ways to choose $n$ things from $n$ alike "a" things $n$ alike "b" things and $n$ different things.
1405
Arrangements of a,a,a,b,b,b,c,c,c in which no three consecutive letters are the same
32508
how many ways can the letters in ARRANGEMENT can be arranged