It is said that any one person in the world can only contact another person through three people

It's seven people.

The distance between every person in the world is only seven people.

The theory of six-degree space, also known as the theory of six-degree separation.

This means that you can know at most any one person in the world through six people

Assuming that a person can know 25 or more people, then after 7 introductions (with an interval of 6 people), a person can be introduced to the 7th power of 25, which is equal to 6103515625 people, more than 6 billion!

Of course, the premise is that the average person knows 25 or more people, and a 2006 Microsoft study showed that the bridge between any two people on the planet needs to pass through an individual on average, which once again verifies the validity of the six-dimensional space theory.

It's a theorem, that is, if you want to know anyone in the world, you need to go through six people in between.

This is a communicative diagram.

It's your friends who know you.

You know friends of your friends.

Just ask any person: Will the other person tell me that the road on the left is right?

Difficult reasoning to understand.

You get the idea.

This is "The Choice of the Door of Life and Death".

There is a law in the study of human relations called the theory of six degrees of separation, which was originally proposed by the Hungarian writer Frigyes Karinthy in 1929, the basic idea of this theory is that any person on the earth wants to have a relationship with any other person, only no more than five intermediaries can be reached, in my diagram is that I and the basketball king Michael Jordan seems so far away, but as long as I rely on my friend Gao Jingyan and his direct contact with Jordan because of his activities at Nike, I can connect with Jordan! Even if you can't find Jordan directly through Brother Gao, you can find Jordan through Brother Gao, and there will definitely be no more than five intermediaries.

In 1967, the American social psychologist Stanley Milgram confirmed this theory in a very interesting way, he randomly selected some people in the Midwest of the United States, handed them a few packages, and asked them to forward the package to a stranger in Massachusetts, the sender only knew the recipient's name, work, and approximate location, but they must use this information to find people who knew the recipient directly, although most of the senders were suspicious at first. They thought it would take hundreds of people to find a stranger in the vast United States, but it turned out that the sender only needed an average of five to seven middlemen to deliver the package, and Stanley's research was published in the journal Psychology Today and attracted a lot of discussion and attention.

This theory is called: six degrees of kevin...It is often translated as "six degrees of separation".

Can you tell us more about it? It's interesting.

Six people are on six continents, and one person on each continent will have a social circle, and each person in his social circle will have his own social circle.

And then it spreads like this, and the circle of one person spreads to the circle of one continent.

There are 199 people who tell the truth, because if there are more than one or two people who tell a lie, and any two of them are false, then it will not be true that one of any two people will tell the truth.

200 people, at least one person tells a lie, then there are only 199 people who tell the truth at most. And there is always one of the two people who tells the truth, that is, at least 100 of them tell the truth. But any two people tell the truth, that is, there is only one one who tells a lie, and if there are two people who tell a lie, it is not any two people.

So, there are 199 people who tell the truth.