Combinatorics Mathematics description

Combinatorics can calculate and enumerate all possible permutations, combinations, ...

Combinatorics algoritmes:
* Permutations of letters
* Anagrams of words
* k-Permutations of letters
* Combinations of letters
* Combinations with repetitions of letters

Extra features:
* Displays the number of permutations/combinations/... with well formatted mathematical symbols using tex/latex
* Ability to share a calculation, for instance to save it to a file or to mail the result
* Option to send feedback from within application