Your mind is in the form of 'super logic' when answering this puzzle

In this world, there are puzzles that are simple enough to be solved in 5 minutes, but complex enough for you to grind your teeth for hours and hours without solving.

The classic puzzle: The "prison cap" below is such a case - enough to make you . not even think about it. Try solving it, you will know whether you have a logical mind or not.

Puzzle: Prisoner hat

There are 4 prisoners who are about to be executed, given a last chance. They will have to stand on the steps like the picture above, the 3rd and 4th people stand on the same floor. There is a wall between the 3rd and 4th people.

Classic puzzle: "Prisoner hat".

1. Person 1 can see people 2 and 3.
2. People 2 can see people 3.
3. Person 3 saw the wall.
4. All did not see the fourth person.

In 4 people, 2 people wear black hats, 2 people wear white hats, but no one knows what hat they wear. In turn, each person had to shout his hat color, if all were released. But if one is wrong, they will be executed.

Note:

1. Do not move or turn your head to look behind.
2. Do not talk to each other
3. Do not put the hat down.

The question is: Who will be the first to shout, and why?

Come to think of it? Think carefully before reading the answer.

Answer:

2nd person

Reason: 3 and 4 cannot know each other's hat color.

1 knows the colors of 2 and 3 hats are white and black, but they cannot know their hat colors.

2 know the hat color of 3 is black. But if the 2nd hat is black, 1 must know that the hat color is white. Because 1 did not speak up, so 2's hat is definitely white.