There are three doors
behind one of them is very expensive car and behind the other two there nothing
u get to pick one door. once you pick your door
one door open. That door doesn't contain the car and it isn't the one that you picked.
you are asked to choose a door from the remaining two the door that you will choose will be opened and you will own what it contains and remember you want the car
Should you stick to the door that you picked earlier or should you pick the other one?