Number of ordered pairs of given string
73575
Number of pairs of strings satisfying the given condition
135836
How to count of sub-string occurrences?
11398
How do I count the number of occurrences of a char in a String?
56233
Is the set of all strings with countably infinite length bijective to $[0,1]$?
18494
Listing all permutations of a string/integer
142477
Closed-form expression for the number of $k$-permutations of length $n$. Duplicates allowed!
136848
Find the number of nonzero elements
98355
Is the set of all possible binary strings countable?
52043
Number of binary numbers with two consecutive zeros
53639
Formula for number of 6 letter words from English alphabet if there is repetion and ordering
82207
Number of Pairs of Subsets
50238
How to calculate the number of palindromes of a given number of characters?
137471
Permutations of a string with duplicate characters
9411
Number of permutations of $n$ elements where no number $i$ is in position $i$
65307
Simple combination/probability question based on string-length and possible-characters
48998
How to calculate number of possible key pairs in RSA
140809
Expected value of sock pairs