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**bssm** Ok well i was watching this show on telly the other night and on of the guys did a maths problem. im trying to show this to my mates because it was pretty amazing. the problem is i can't remember how he explained it works. it wasn't so much a problem as a fact. it was...

if there are 3 doors, behind 1 is a car, behind the other 2 is a dud prize...obviously you want the car. so you pick the door you think it is behind. then one of the other doors is opened and it is a dud prize. So the car is either behind your door or the other. Do you change your answer? on the show it turned out that there is more probability of getting the car if the answer is change but i can't seem to remember or figure out how this is possible.

So could someone please explain this to me or is not true?

Thanks.