There’s 3 doors. 2 don’t have a prize, and one does.
The odds you pick the door correctly on the first try is 1/3. They reveal a door that you didn’t pick and doesn’t have a prize. The odds your door is correct is still 1/3 because the reveal of that other door doesn’t change that first decision you made. That means switching doors will give you the prize 2/3 of the time.
Imagine instead there were 100 doors and 1 prize. If you oick a door at random, it’s a 1% chance to be right. We then open 98 of the doors that don’t have a prize. There’s a 99% chance the other remaining door has the prize and a 1% chance you guessed correctly on the first try. It’s not the 50/50 that people think it is.
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