>Restate the problem thusly, and it all become clear.
>
>When you are presented with three doors, you choose one
>which you do not wish Monty to discard. It doesn't matter
>what's behind it. You're not trying to pick the prize door.
>
>Monty opens a door, which has no prize behind it. You are
>now presented with a simple choice - and here's what you
>know:
>
>One door has the car, one door doesn't. That statement is
>100% absolutely certain.
>
>NOW, you make the choice - which is it? Door A or Door B?
>It's a 50:50 choice...

Repeat after me.

Dont' open the door then place the car.
Place the car then open the door.
Place, then open, don't open then place.
If you first place the car in door number one you will
see that only half that time is door two opened.
When the car is placed in door3 all the time door 2 is
then opened.

Place then open. Place then open. Don't open and place