How to randomly spawn 3 out of 10 questions from library? AS3

[Climbatize]

So i'm really new at flash and i'm having some trouble with a textbook assignment.
Before i explain my problem here is the code:

stop();

var defValue:Number = 1;


stage.addEventListener(Event.ENTER_FRAME, vetIkke);

function vetIkke(e:Event){
	while (defValue < 3){
		defValue ++;
	        var randomTall = Math.floor((Math.random()*10)+1);
                var randomQ:String = "question" + randomTall;
		var Question:MovieClip = new randomQ();
		Question.x = 53;
		Question.y = defValue*83;
		addChild(Question);
	}
}

I was doing some assignments in my as3 textbook when i ran into a bit of trouble. I'm trying to make a flash that picks 3 random questions out of a total of 10 and displays them on screen. I made each of the questions movieclips and assigned them all a class (question1 - 10) through Linkage. So the variable "randomQ" is the name of the class of a random question, but how do i get flash to understand that? And how do i spawn that question as a movieclip on stage?
I'm guessing it has something to do with this line of code:

var Question:MovieClip = new randomQ();

I've tried various alterations but can't seem to find the right one. It's possible i've yet to learn the neccesary knowledge in order to make this flash, and in that case i really need all the help i can get. What is wrong and why isn't flash creating the movieclips i want it to?

Any help is really appreciated!

[Climbatize]

I realize now a better title might have been, "How do I spawn random movieclips from classes on stage" or "Can't convert string variable to movieclip variable" or something like that.