Find possible variations of one item out of multiple baskets. ref: http://programmers.stackexchange.com/questions/227908/find-possible-variations-of-one-item-out-of-multiple-baskets

program.cs

class Program
{
    static void Main(string[] args)
    {
        IEnumerable<string> basket1 = new List<string> { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10" };
        IEnumerable<string> basket2 = new List<string> { "11", "12", "13", "14", "15", "16", "17", "18", "19", "20" };
        IEnumerable<string> basket3 = new List<string> { "21", "22", "23", "24", "25", "6", "7", "8", "9", "30" };

        foreach (var item1 in basket1)
        foreach (var item2 in basket2)
        foreach (var item3 in basket3)
        {
            Console.WriteLine("{0}, {1}, {2}", item1, item2, item3);
        }

        Console.ReadLine();
    }
}