C# の混合配列とは何ですか?

var x = new object[] {89,45,"jacob",9.8}

var x = new object[] {87, 33,"tim",6.7, new List() {"football","tennis","squash",“cricket”} }

Tuple tuple = new Tuple(60, "John");

using System;
using System.Collections.Generic;

class Program {
   static void Main() {
      // Initializing collections
      Tuple tuple = new Tuple(99, "Jack");
      if (t.Item1 == 99) {
         Console.WriteLine(tuple.Item1);
      }
   }
}