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Classically, consider a deck of cards. If I draw a bunch of black cards in a row, are you more likely to now draw a red card? My first card draw was normal, and nothing can change that. A subsequent draw is different.

There are no longer 52 cards. The ratio of black to red is no longer equal. You might say the rules have changed. They have changed in your favor. Selecting a second time, from fewer gameshow doors, has different odds from selecting from the initial total of doors. This is how I thought about it: There are 3 equally likely scenarios. Door A is correct. In this case, you would be better off staying. Door B is correct. Monty would open C and you would be better off switching. Door C is correct, Monty would open B and you would be better off switching.

Two out of three times, you are better off switching. Then that choice goes out the window and we are left with only 2 choices. The problem with your explanation is this: After you make your first choice the combinations behind the remaining two doors are: If Monty Always picks a Goat then the remaining door contains: Goat 1 or 2 Car Car. Better than that 10 pages-long contrived and non-convincing explanation above. I get how this works from a statistical point of view. However, it fails to function.

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The only thing that actually alters is your perception. No extra probability is handed to the first door until a new random choice is made.

Everything hinges on making a random choice. It came from making a random choice. Why are both doors examined before they are opened? I find that part confusing. So did he open both doors or only one? We humans have a habit of being acquisitive. Once we choose something, we have a tendency to want to hang on to it. Take a pack of cards — it contains a single Ace of Diamonds — this is the winning card — pick the Ace of diamonds and you win. Shuffle the pack and take a single card out — lay it on the table.

Put the rest of the pack on the table beside the single card. Now, the choice is pick the single card or pick the rest of the pack — which do you thinks is most likely to give you the Ace of Diamonds. Clearly, most people would choose the pack with 51 chances that they have chosen the Ace. As before, pick a card and lay it on the table, but before putting the pack down, somebody sorts through the pack and if it contains the Ace of Diamonds, they put it on the top of the pack and then put the pack on the table.

Now you have the choice of taking the single card or the top card off the pack — again, automatically folks will take the top card from the pack. Next the pack is sorted and if the Ace is present it is put on the top of the pack. The top card is taken off the pack and placed beside your chosen card and the rest of the pack are turned face up to show that they are not the Ace of Diamonds. Now you are offered the choice of changing the card you chose for the remaining card from the pack.

The reality is that This means that Another way that came to me is that there are only 2 versions of this game. Since this is true, I am going to use the winning strategy that applies to I will win about I learned about this a while ago but never tested it until today. I tried picking a door and switching 20 times twice. Each time the score was 9 wins and 11 losses. One sixty seven percent win. Think of it like this.

You have a coin which has three possible landings: Your choice is either heads or tails because no matter what, one option will be nonexistent. To restate it in your terms: There will be a door you will never pick, but will always be a goat. There is one goat you will never choose. You will either have a goat 2 or a car.

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In other words, there was a chance he could have opened the car door, thereby spoiling the game. It would be no new information if Monty randomly revealed a door.

So, you have the choice of 1 your original door or 2 the best of the other side. But since you saw the process, you know which door went through the filter. Good feedback, I should clarify.

Monty looks behind both doors, but only fully opens one for you to see. You bring up a good point — how many trials do we need to be convinced of something? Monty can add and take away doors on the other side, but at the time of your initial guess, it was a 1 in 3 chance of being right.

Try giving the game a shot with trials to see what happens: Yes, if Monty randomly opened a door and it happened to be a goat , it would indeed by But since Monty is looking at TWO doors and leaving you with the better one , it is an advantage to switch. Or for doors. Pretend we are dealing with a lottery that everyone in the world plays — each person is given a ticket which is equally likely to win.

Would you expect yourself to be the winner, or someone else in the world? The intuitive and correct answer is to expect someone else.