There are 3 doors, and one of the 3 doors has 24K gold. Pick one door here
If you choose, there is nothing when you open one door here. At this time, is there a high probability of drawing 24k gold in the first choice or a high probability of drawing 24k gold in the second?
answer is below
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The answer is that the second time is more likely to be picked because the first time you can pick it with a 1/3 chance, but the second time you can pick it with a 1/2 chance.