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Let's put it like this. If there are a zillion doors and you choose one you must agree that it's unlikely to have a car behind it. Now I start opening doors, when I get to the end there is one door left unopened and the only reason it's unopened is because I know there is a car behind it.
Simple really.
I guess some of you get suprised when every time there is a piece missing in a jigsaw puzzle it's always the last one!
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