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on the doors one..
The results are muttually exclusive, meaning that the door you pick in the first instance does NOT affect the second choice.
And we know that the quiz master picks a losing door- this is significant. if u have the right door to start with the choice is random. if u have a wrong dor the other wrong /*door opens. so no matter what happens ur left with a right door and a wrong door. This means the results are mutually exclusive. You therefore have a 50% chance of picking the right door.
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