using System; using System.Linq; using System.Collections; using System.Collections.Generic; public class MainClass { public static void Main() { string[] presidents = {"Ad", "Ar", "Bu", "Bu", "Ca", "Cl"}; IEnumerable<string> sequence = presidents.Where((p, i) => (i & 1) == 1); foreach (string s in sequence) Console.WriteLine("{0}", s); } }