How to stop the same frame being played twice.

Question

Hi,
I am creating a quiz in flash using AS 3.0
I need the order of the questions to be in a random order which I have worked out how to do.
I now need to make it so the questions are shown only one, I've tried looking on the internet but I've not been able to find anything that a: helps and b: I understand.
stop();
BTcorrect.addEventListener(MouseEvent.CLICK, nextQuestion);
function nextQuestion(evt:MouseEvent):void {
  var q_number :  Number = 3;
  var randomFrame:Number = Math.ceil(Math.random() * q_number);
  trace(randomFrame);
  gotoAndStop(randomFrame);
here is my code so far, I dont know where to go from here.
Thank you in advance.
Matt.

Answer 1

you can use the shuffle function to randomize any array and then loop through the randomized array to ensure you're accessing no duplicates:
function shuffle(a:Array) {
    var p:int;
    var t:*;
    var ivar:int;
    for (ivar = a.length-1; ivar>=0; ivar--) {
        p=Math.floor((ivar+1)*Math.random());
        t = a[ivar];
        a[ivar] = a[p];
        a[p] = t;