random.range not working in a variable

I am trying to make an intager a random number between 1 and the length of a list

code can be found here:

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class GameControllerScript : MonoBehaviour {
public static List <int> Cards = new List <int>();
public int RndCard;
public static int CardNo;
public static bool Active = true;

void Start()
{
    Cards.Add(1);
    Cards.Add(2);
    Cards.Add(3);
}

void Update()
{
    print(Random.Range(1,Cards.Count));
    if(Active == false)
    {
        Active = true;
        RndCard = Random.Range(1,Cards.Count);
        CardNo = Cards[RndCard];
        Cards.RemoveAt(CardNo);
    }
}

the print statement works but the "RndCard" variable dosent even though they are neer enough the same statement