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yup, the answer is you should change your guess. in the first try, you had 33% chance of getting it right. on the second try, if you change, you now have a 50% chance. if you dont change, even though there are only 2 choices left, you still only ahve a 33% chance of being right. you can experiment if you want, get a friend, and do this 100 times and see what happens. then do it 100 times w/out changing after he shows the wrong option.
it sounds stupid, but it's true.
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