Do you know Monty hall problem?
This is a quiz introduced on an American TV program.
It was introduced several times on Japanese TV.
Many people should know it.
Difficult quiz that most people cant.
Of course I couldn’t.
But some people with high IQ can answer immediately.
When I knew this ，I understood my stupidly.
And I wanted to live modestly.
Because from their point of view I am just a smart monkey.
Then that is the question.
There are three house.
Only one of the three house has a donkey.
Which house has a donkey?
After you choose one.
The questioner excludes one of the two you didn’t choose.
The rest is the one you choose and one more.
At this time,
the questioner says that the choice may be changed.
Should you change or not?
This is the question.
The correct answer should change.
There is a 1/3 chance of choosing one of the three.
If you don’t change the answer the probability is 1/3.
If you change the answer the probability is half.
So you should change it.