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It's in the book "The Curious Incident of the Dog in the Nighttime" I think it's called the Monty Hall Problem?
 

Hello Elin.

So... Why not believe it then Haz?
 
Well, what happened in the past, contributes to the future?

I'll get my book to see what it says...
 
Wasnt the vetting t'day Haz?
How'd it go?

He passed :)
Now to the stress of deciding where to stable him.
I really really really want a school especially while he settles with us but not many livery yards have them.
 
Marylin vos Savant has the highest IQ in the world, according to the Guinness Book of World Records. She says that the answer is 2/3.

Loads of people wrote into her, saying she was wrong, including mathmaticians and scientists. Using Maths, here's the answer.

Let the doors be called X, Y and Z.

Let Cx be the event that the car is behind door X and so on.

Let Hx be the event that the host opens door X and so on.

Supposing that you choose door X, the possibility that you win a car if you then switch your choice is given by this formula:

P(Hz^Cy) + P(Hy^Cz)
= P(Cy).P(Hz|Cy) + P(Cz).P(Hy|Cz)
= (1/3.1) + (1/3.1) = 2/3
 


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