How to get images from an array visible via random numbers

I have a public array full of Images from the inspector. A method runs which for 6 iterations, should generate a random number which links to an index in the array and makes that image visible.

When I run the program however, nothing actually happens, all images remain invisible. Can anyone identify the issue?

This is my code:

 public class CoinDecider : MonoBehaviour {
 public Image[] Images; //array of images, assigned through inspector

 public void Start()
 {
     //for 6 iterations, a random number between 1 and 16 is generated
     //that number is assigned to the index of one of the images
     //said image becomes visible
     for (int i = 0; i < 6; i++) 
     {
         int number = Random.Range(1, 16);
         var selected = Images[number];
         selected.enabled = true;
     }

     }
 }

Just for extra insurance, this is what the list from the inspector looks like (all images are placed on screen but defaulted to invisible at the start of the game):