Remove random index from an arrayList

I have an array list of 4 items, i need to remove one item randomly and display the updated array list. However my random keeps targeting the second and third element on the array list. as far as i understand my random would count like this. 0 1 2 3 , shouldnt that be enough to cover my 4 elements, why does it keep targeting the same indexes? I have tried increasing the random number (4) + 1, but that puts me out of bounds.

 Random rand = new Random();
  Scanner input = new Scanner(System.in);
  int numberOfGuests = 4;
  ArrayList<String> guestList = new ArrayList<>(4); 
  System.out.println("Enter 4 guests:");

   for(int i = 1; i <=numberOfGuests; i++){
      System.out.printf("guest%d: ", i);
      guestList.add(input.nextLine());
   }
   System.out.println("Guest List: " + guestList);
   String remove = guestList.remove(rand.nextInt(4)); 
   System.out.printf("%s can't come%n" , remove);   
   System.out.println("Guest List: " + guestList);