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OK. Ill repeat the puzzle here for clarity...
U are at a game show. U choosec one door- possibly the one of the 3 that has a prize behind. Then 1 wrong door is eliminated. U can now switch doors. Should u, and y?
The correct answer is it doesnt matter. NO matter what happens you are left to choose between what must be a right door and a wrong door. This means u have 2 choices- right or wrong. 1 of these is useful, one is not. Therefore refering to every good probablility book i know of- Probabliity= Useful Choices/ Possible Choices.
this ends up being 1/2, or 50%.
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