How to break into a math book

Tu Hua stared blankly at the direction where the exit disappeared, and knelt on the ground to push away all the weeds around him, but the entrance of the [Life and Death] checkpoint seemed to have never appeared, and there was no trace of it anymore.

Su Gechi did not follow.

Tu Hua sat on the ground dejectedly, his eyes a little sore.Does this mean that Su Gechi is trapped in that perverted level forever and can't get out?Did he go to the abyss, or was his personal freedom imprisoned by the virus?Or...he actually came out?

That's right, Su Gechi is such a supernatural person, how can such a small virus trick trap him...

Tu Hua rubbed his eyes and quickly got up.He called Su Gechi's name all the way, from the teaching building to the library, from the library to the playground, and from the playground back to the flower bed in front of the cafeteria.

He shouted until his voice was almost hoarse, but Su Gechi still didn't respond to him.

Shen Siyi held him back: "Don't look for him, he... can't come back."

Tu Hua was still wandering around: "Impossible, he developed the game, how could he not come back..."

"But he's just an NPC now!" Shen Siyi looked at him with a frown and paused, "We don't know how bad the virus is, and we don't know whether he can come back."

"But if he doesn't come back all the time, won't you break through the barrier?"

Tu Hua looked at Shen Siyi, and his eyes finally focused slowly.Su Gechi fished him out of the abyss just to let him pass all the levels, just to make him the hope of saving the game and all the trapped challengers.

He did rely on Su Gechi a little bit, but even if Su Gechi was gone, he had to complete the challenge alone.Without the company of Mr. X, he still wants to become the strongest challenger who can fight against the virus.

Shen Siyi patted him on the shoulder: "Calm down, I just saw Sun Wei and Tang Bo, we can pass through together next."

Tu Hua nodded, and smiled at him apologetically: "I... just got impulsive."

Shen Siyi looked at him, his eyes were dim, and after a while he said: "I can understand."

She has tried hard to convince herself, but Tu Hua is still very sad.For some reason, he always felt as if he was going to lose Mr. X forever.In the game, he and Su Gechi are in a cooperative relationship, and he can enjoy his company as he should, but if he really clears the level and leaves the game, can he still see Su Gechi?

Su Gechi is so lofty and outstanding, but he is just a high school student who can't even pass the A major.After leaving the game, their world will gradually drift away, and he will never be able to get close to Su Gechi.

This feeling is very bad, there is a sense of loss that is about to wake up from a dream.

Tu Hua sighed, trying to get rid of the depressed emotions in his chest, and followed Shen Siyi to find other teammates.

Sun Wei and Tang Bo had just cleared a level, and at this time they had reconciled with Wang Boyu. Wang Boyu was telling them about Tu Hua's escape from Hippahos and the encounter with the virus. When he saw Tu Hua who was alone, he said in surprise: " Where is Mr. X?"

Tu Hua's voice was low: "He was trapped by the virus."

Wang Boyu opened his mouth exaggeratedly: "Didn't we lose one of the most powerful thighs?!"

Sun Wei on the side noticed Tu Hua's mood, and quickly patted him on the back of the head. Wang Boyu realized this, and quickly changed his words: "Even if Mr. X is not here, we will definitely pass the level! Three stinky A cobbler is better than a Zhuge Liang, not to mention we have five cobblers!"

Sun Wei rolled his eyes at him: "Only you are a cobbler."

Wang Boyu scratched his head with a smirk.

Tang Bo also persuaded Tu Hua with a smile: "It's okay, Tu Hua, don't you see that the five of us were invincible when there was no Mr. X?"

"Yes," Sun Wei encouraged Tu Hua, his eyes were very determined, "We will definitely pass the level."

Tu Hua stared blankly at this group of kind and enthusiastic partners, and his heart immediately warmed up.Even if Su Gechi is not there, he still has his own way to go. There are not only unprecedented scenery on the way, but also the most precious friendship.Perhaps he and Su Gechi are not from the same world, but at least he, like Su Gechi, is working hard for a living, and that's enough.He believes that as long as he works hard, one day he will be able to stand side by side with Su Gechi.

经过之前所有的支线关卡，涂化目前的主线任务通关率仍然是2/67，王博宇也没有变，还是21/64，沈思易的通关率是5/18，孙维和唐博分别是9/31和11/45。

Tu Hua originally thought that people with a higher clearance rate should wait in place and stop participating in side quests, lest the clearance rate continue to drop, but others disagreed. They all felt that since there was an opportunity to increase the clearance rate, they should give it a go .

Even Wang Boyu, who had just rested for a round, thought so. He looked at Tu Hua excitedly: "We finally have the opportunity to break through together. How can we waste this opportunity?"

Tu Hua had no choice but to obey the majority, and chose a level for the five people that seemed to be a multiplayer task - [Digital Friendship Competition].

The level of this [Digital Friendship Competition] is in the basketball hall. After the five of them entered the level, they found that there were already five challengers waiting.

And the environment of this level looks normal, and even retains the appearance of the basketball court. A row of square cards of different colors are placed directly under the basketball hoop. There is a system screen floating on the left side of the card. There is a string of strange characters on the screen. Strange number, I don't know what it is for.

【Ding--】

[Submission: Digital Friendship Contest]

[Rules: There is a 28-digit number, which is composed of 28 natural numbers on the left screen, 18 of which are fixed, and the other 10 digits will be randomly assigned.The challenger needs to determine the probability that the 28-digit number is divisible by 396.The challengers will be divided into two groups, five people in each group, one challenger will be sent to fight against each other in each round, and each challenger will only have one chance, the winner can choose to check the 3-5 digit number, and the loser will be eliminated directly.Whichever group is the first to answer the number divisibility probability can pass the level. 】

This rule seems complicated, but in fact, only one thing is required for the challenger, which is to judge the probability that the 28-digit number is divisible by 396.

Tu Hua looked at the row of colored cards under the basketball hoop, there were 28 in total, and the numbers on the screen next to it were also 28 in total, which meant that this row of cards was actually the 28-digit number, and it was composed of 28 numbers on the side. Composition of numbers.The rules say that 28 of the 18 digits are fixed, and the other 10 will be randomly assigned.

That is to say, the challenger needs to calculate the probability that the 10-digit number is divisible by 28 when the 396-digit number is randomly assigned.

For this string of numbers that is still unknown, challengers need to fight each other to obtain information.Only one person can be sent at a time, and the Tuhua team and the opposing team will each send one person to fight some kind of confrontation required by the system. The winner can check the 28-3 digits in this string of 5 digits, and the loser will be eliminated directly.

If any group can judge this probability first, then the judge can pass the level if the judgment is correct, and the other group will be eliminated if there is no accident.

The competition system is actually not complicated, the difficulty lies in judging the probability.At least Tu Hua is confused about the problem of divisibility now, and his scalp feels numb when he looks at the 28 numbers.

Wang Boyu felt the same as Tu Hua: "28 digits! Divisible by 396?! I have to use a calculator for a long time, how can my brain calculate it? And I have to judge the probability when I don't know the number? It's too perverted!"

孙维和沈思易两个学霸却跟没听见似的，镇定地讨论结果：“这道题目应该和最小公倍数有关。396=4×11×9，这就意味着只要这个数字能同时被4、11、9这三个数整除就行。”

Sun Weining frowned and thought for a while: "The divisibility problem is actually a technical problem. For example, for a number that is divisible by 4, you only need the last two digits to be divisible by 4."

Tang Bo also nodded: "I remember that the number divisible by 9 seems to only need the sum of all digits to be divisible by 9."

Shen Siyi agreed: "Yes, the number divisible by 11 only needs to be divisible by 11 by subtracting the sum of the numbers in the odd positions from the sum of the numbers in the even positions."

Tu Hua and Wang Boyu were dumbfounded: ...

Tu Hua swallowed his saliva, and looked at Wang Boyu contemptuously: "It's fine that I'm a scumbag in mathematics who doesn't know these things, but you are also a person who has passed 140 points in mathematics, why don't you know anything?"

Wang Boyu looked at the three of them adoringly: "I barely passed 140, you ask the three of them...is there anyone who has passed 140?"

Tu Hua: ...I'm only going to seek abuse when I'm crazy.

However, although they quickly discussed the conclusion of divisibility, the calculation of the probability is obviously more difficult, and the three masters couldn't think of a way.

Just as they were struggling, a whistle suddenly sounded behind them.Wang Boyu turned his head, his jaw almost dropped when he saw the man behind him: "Mr. x... Mr. x?"

Tu Hua froze for a moment.

He turned around in disbelief, and saw Su Gechi wearing sportswear, standing in the middle of the basketball court, holding a whistle in his hand, looking at him with a smile on his face.

Tu Hua stared in his direction obsessively, and slowly paced forward.But Su Gechi's movements were obviously faster. He walked up to Tu Hua in two or three steps, looked down at him, and said softly, "I'm the referee for this round."

Tu Hua had a thousand words in his heart, wanted to question him what was going on, and wanted to express all his worries, but in the end all his emotions turned into surprises of lost and found.

Unable to speak for a moment, Tu Hua's body had involuntarily approached Su Gechi, reaching out to hug him.

Su Gechi froze for a moment, then patted him on the back softly: "I'm sorry...for making you worry."

Another group of boys who had been standing by and watching looked confused: "What's going on? The game hasn't even started yet, why did you hug the referee?"

Wang Boyu, who was being happy for Tuhua with a rippling smile, immediately turned around: "None of your business!"

Another group of five challengers feel wronged: the game has shady scenes.JPG