How to break into a math book

The next level is [Probability Level].

Tu Hua checked the number of people in this level, and found that the number of survivors has dropped sharply, and there are only more than 1000 people still fighting.Looking at this huge campus, I felt a little desolate for no reason.From 20 people at the beginning to more than 1000 people now, if the effect of the virus is strong, coupled with the crazy slaughter of NPCs, the number of people will decrease even faster.

And all eliminated people will be exiled in the cracks of the system, unless someone clears the level, they will never be able to leave.

【Ding--】

【Welcome to Probability Level. 】

The system's prompt sounded in time, and the system screen in front of Tuhua popped up, scrolling and playing the clearance rules of this level:

[Probability level rules: The clearance rate of the main line task is obtained through the accumulation of side tasks. Those with a high clearance rate will reduce the difficulty of the main line task, and those with a low clearance rate will increase the difficulty. 】

This is another level linked to the customs clearance rate.The introduction of the rules is actually very simple. If Tu Hua understands it well, the clearance rules of this level are basically the same as those of the original function level. Every time you clear a branch task, it will increase the clearance rate of the main task by a certain percentage. When this percentage is high enough, the challenger can safely participate in the main quest.

Su Gechi also nodded and said, "This level is actually not too difficult. If the virus doesn't affect you too much, you can basically get a [-]% clearance rate for the main task after clearing five to six side tasks."

But the premise is that the impact of the virus is not great.None of them knew what this terrible virus had turned the system into. If it was just the NPC going crazy, it would be easy to deal with, but they were afraid that the mission rules and customs clearance content would change.So Tu Hua did not dare to take it lightly.

Tu Hua found a level called "Virus and the Infected" near the gymnasium. Perhaps it was the word virus that attracted him. He always felt that this side mission might be related to the game virus.

But it turns out he was overthinking it.Su Gechi explained: "This is just a level to calculate the virus and infection probability. You can try it. It's very simple."

Su Gechi still plays the role of Mr. X beside Tu Hua, but due to the limitation of the NPC program, he can't give Tu Hua too many hints, but he can tell him some customs clearance points and information, and make a decision during the customs clearance process. Some suggestions, but the control and thinking of the entire level task still needs to be done independently by Tuhua.

Since Su Gechi also said that this level is not difficult, Tu Hua decided to give it a try.

This [Probability Level] did not require challengers to form a team. Tu Hua thought that most people would go through the level alone, but he did not expect to meet so many people in the [Virus and Infected] level.

The scene of this level seems to be in a hospital. The system shows that the number of people in this branch level has reached 96, and the upper limit is 100. That is to say, the task will not be opened until the number of people reaches 100.

This hospital is not big, the decoration looks very dilapidated, and the plaque at the door has also fallen off, making it look gloomy.Most of the challengers waited in the lobby, and some went to the consulting room on the second floor.Tu Hua thought that there were many people here, maybe he could meet acquaintances, and was about to go to the crowd to find his former teammates, but Su Gechi stopped him.

I saw Su Gechi's face was serious: "The virus tampered with this level."

Tu Hua was stunned: "What does 'tampering' mean?"

Su Gechi said: "This level was originally a single-player game mode, but now it has been changed to a hundred players. I don't know what will happen. You have to be careful."

Before he could make enough mental preparations, the system beeped. It should be that four more people entered the checkpoint, and the 100 people in this checkpoint were all together.

【Ding--】

[Submission: Viruses and Infected]

[Rule: Virus M is spreading in the hospital. It is known that the infection rate of this virus is 10%. The doctor will examine everyone. The doctor’s misdiagnosis rate of virus M is also 10%. Please judge if the doctor confirms that the infected person survives What is the rate. 】

The rules had just been promulgated, and when everyone was concentrating on reviewing the questions, the system speakers suddenly made a buzzing sound, and the subtitles began to twist and twist, and the original rules suddenly changed.

[Rules: Virus M is spreading in the hospital, and among all 100 challengers who arrived at the hospital, 10% have been infected with M virus.The virus will be reinfected every hour, and doctors will examine all challengers, with a misdiagnosis rate of 10%.Please isolate all infected people, and healthy challengers can pass the level. 】

Sure enough, the rules have changed!

From the original probability calculation problem to a level where challengers can kill each other!According to the newly promulgated rules, 100 of their 10 challengers have been infected since entering the hospital.They must eliminate these 10 people in time, otherwise 10 infected people will infect other healthy challengers one hour later, and the cycle continues, and everyone will be infected with the virus.

And how will the selected 10 infected people be dealt with?Although the rules were not mentioned, Tu Hua could also think of it—the only thing they faced was elimination.

This level of pure luck really appeared.

Sure enough, after the promulgation of the new rules, the 100 challengers panicked.Everyone looks normal on the outside, but everyone is very panicked and dare not approach other people for fear of being infected.

At this moment, the door of the doctor's office opened, and a man in a white coat with a strange smile appeared in front of everyone.

His face was yellow, and his eyeballs were covered with strange bloodshot eyes. Compared with the challengers around him, this doctor looked more like a virus-infected person.

It should be that his image is too terrifying. When the challengers saw him, they all backed away involuntarily.But the doctor didn't take it seriously. He showed an exaggerated smile and stared at the challengers around him eeriely: "Welcome everyone to 'Youjia Hospital' to experience our most beautiful and magical M virus!"

He looked around at the crowd, and made an excited "tsk tsk" sound: "Let me see, how many people have been lucky enough to be infected..."

He glanced over the challengers in the front row, and soon settled on Tu Hua.To be precise, it was on Su Gechi behind Tu Hua.

A trace of the virus program's fear of anti-virus software flashed across his face, and he quickly put on a sinister smile: "Except for the challengers...it seems that there is an uninvited guest here..."

Su Gechi glanced at him coldly, took a step forward, grabbed his neck with one hand, and lifted him up easily: "To clean up the virus...you can't use a too gentle method."

The NPC doctor's eyes were red, but at this moment, Su Gechi couldn't breathe, his face turned red, and the veins on his neck were entangled, making him look even more terrifying.Although he was controlled by others, he still glared at Su Gechi fiercely: "What if you are the creator or the judge? Now this is my checkpoint. Unless you pass the checkpoint in my way, none of you can leave here! "

Su Gechi paused and threw him on the ground: "You'd better not play any tricks."

The doctor's words are not wrong. No matter how powerful Su Gechi is, he is still subject to the identity of an NPC in the game. His identity can only work in the levels where the system stipulates that he appears, and in other levels, he is just a companion. It's just a painted prop.Even if the virus-infected NPC is killed, these one hundred challengers cannot pass the level.

The doctor got up and angrily said to the challengers in the hall: "Line up one by one! Come to me for an examination!"

After the farce just now, although most of the challengers didn't know what happened, they still obeyed the rules obediently and waited in line for the doctor's examination.

It was said to be an inspection, but in fact it was just a judgment procedure. Tu Hua was at the end, but within five or six minutes, it was his turn.The doctor glanced at him angrily and said, "You are not infected!"

At this point, the examinations of all 100 challengers have ended.When Tu Hua walked out of the office, he saw that most of them were standing in the hospital lobby, only a few people were hiding in the corridor with worried expressions, and some girls even started crying.

Tu Hua walked over with a frown and asked, "Are you all infected?"

The few people nodded, and one of the infected boys comforted him: "Don't worry, the rules just said that the misdiagnosis rate is 10%."

Tu Hua looked around and said loudly: "All infected people, please gather here!"

A few more people came over one after another, their expressions were either flustered or hesitant, and there was a boy standing in the crowd who refused to come out. The tall boy behind him kicked him and said disgustedly: "You are an infected person. ! Stop pretending! I was standing right behind you, I heard you!"

The infected boy had a painful expression: "I don't want to be eliminated..."

Most of the group of healthy people avoided him in disgust, and a few boys even wanted to beat him up because of his lack of cooperation.Tu Hua hurriedly said to the infected boy: "It's okay, you come here first!"

The boy hesitated for a while, then walked over slowly.

Tu Hua stood in the middle of the corridor and the hall, and counted, there were 18 infected people in total.

Some people in the healthy population also found a problem: "A total of 10 people, the infection rate is 18%, why are there [-] infected people?"

Another replied: "Because the doctor will misdiagnose."

"But the misdiagnosis rate is also 10%. The number of 18 is very strange. Could something be wrong?"

The tall boy who kicked people just now said contemptuously: "No matter what the misdiagnosis rate is, all the infected people are among these 18 people anyway, as long as they are handed over, the rest of us can pass the level."

Originally, when the 18 people heard that they might be misdiagnosed, there was a glimmer of hope in their hearts, but when they heard the boy's statement that "I would rather kill a thousand by mistake than let one go", they became nervous again.Coupled with the disdainful expressions of the remaining 80 healthy people, they seemed to be spurned poisonous insects.

Tu Hua frowned, staring at the tall boy among the healthy people, and said slowly, "Who says healthy people must be healthy?"