AS3 -How do i randomize quiz questions in actionscript3?

So I have a quiz game in flash and basically you need to type the answer to answer 4 questions. In the end, it will show you the SCORE and your answers vs. the correct answers. 1. I need help on how to randomize the questions (without repeating the question) 2. In the end the correct answer needs to match the order in which the player answered the question.

I attached the pictures below.

end game screen

The code: Frame 1

stop();
var nQNumber:Number = 0;
var aQuestions:Array = new Array();
var aCorrectAnswers:Array = new Array("Jupiter", "Mars", "war", "Titan");
var aUserAnswers:Array = new Array();
aQuestions[0] = "What is the biggest planet in our solar system?";
aQuestions[1] = "Which planet in our solar system is the 4th planet from the 
sun?";
aQuestions[2] = "Mars is named after the Roman god of ___.";
aQuestions[3] = "What is the name of Saturn's largest moon?";
questions_txt.text = aQuestions[nQNumber];
submit_btn.addEventListener(MouseEvent.CLICK, quiz);
function quiz(e:MouseEvent):void{
aUserAnswers.push(answers_txt.text);
answers_txt.text = "";
nQNumber++;
if(nQNumber < aQuestions.length){
questions_txt.text = aQuestions[nQNumber]}
else{
nextFrame()}}

Frame 2

var nScore:Number = 0;
for(var i:Number = 0; i < aQuestions.length; i++){
this["userAnswer" + i + "_txt"].text = aUserAnswers[i];
this["correctAnswer" + i + "_txt"].text = aCorrectAnswers[i];
if(aUserAnswers[i].toUpperCase() == aCorrectAnswers[i].toUpperCase()){
nScore++}
if(i == aQuestions.length - 1){
score_txt.text = nScore.toString()}}

Any info/help needed pls.