Words combinations without repetition

Question

I have 10 words. How can I get all possible combinations of 5 words (n=10, k=5). The order does not matter.

For example: \"A\",

Answer 1

What about a more functional solution

var list = new List { "a", "b", "c", "d", "e" };
GetAllCombinations(list).OrderBy(_ => _).ToList().ForEach(Console.WriteLine);


static IEnumerable GetAllCombinations(IEnumerable list)
{
    return list.SelectMany(mainItem => list.Where(otherItem => !otherItem.Equals(mainItem))
                              .Select(otherItem => mainItem + otherItem));
}

Ouput:

ab
ac
ad
ae
ba
bc
bd
be
ca
cb
cd
ce
da
db
dc
de
ea
eb
ec
ed