Seeing the people of the blue team exiting the room, Mu Xiaoqing looked at Ren Shuai with a bitter face.

"Teacher Li, will five minutes be too short?"

"yes, it would take ten minutes just to understand this question." Cui Zixun followed.

As a science and engineering man, Ren Shuai has always been strong in mathematics, especially when he was a child, he also experienced the baptism of Olympiad mathematics, and he has never been a problem in this regard.

He had already swept the question just now, it was not too difficult, five minutes was enough.

The topic is like this, three friends A, B, and C are playing games, two people play against each other, and the other person acts as a referee, and the person who loses each game goes to the next game as a referee, and after a battle, it is found that A has played a total of 17 rounds, B has played a total of 25 rounds, and C has been a referee 7 times.

Q: Who is the judge for Round 5 during the game?

Not to mention the first few rounds, it is difficult for Cui Zixun to calculate how many rounds he has played.

Several people looked at their watches, their faces full of helplessness.

But Ren Shuai can't be blamed for this, after all, people agreed out of kindness.

Besides, the three of them won't at all.

"Why don't we go straight to the next clue?" Mu Xiaoqing was afraid that Ren Shuai would not be able to come to the stage, so she hurriedly changed the topic.

Ren Shuai didn't answer, and seized the time to calculate silently for a while.

Seeing that five minutes were approaching, the blue team at the door was ready to come in.

"Yes A."

Ren Shuai looked at the staff and replied simply and forcefully.

"Congratulations, you got it right."

The staff smiled and spoke.

Mu Xiaoqing, Cui Zixun and Qiu Yun looked at each other, and they didn't react to what was happening.

"Wow, Mr. Li actually solved it, it's amazing!"

"Hahaha, now it's up to Suotu and Avan to get stuck."

The cheers of several people immediately attracted the attention of the blue team at the door, and hearing that Ren Shuai had answered correctly in just five minutes, Suo Tu walked into the house in disbelief.

In fact, he had already seen the question just now, and he had been silently calculating it in his heart.

However, the time is too short, and the final answer has not yet been received.

It's just that I didn't expect the red team to answer first.

Ah Fan glanced at Suo Tu and asked in a low voice, "Didn't you say they didn't play?" “

Suotu looked at the problem again and said with a smile: "This problem is difficult to solve, but it is easy to get it right." “

After hearing this, Mu Xiaoqing and the others looked a little unhappy, but Suo Tu was right, there were three people in total, A, B, and C, and the probability of being right was as high as one-third.

Ren Shuai smiled and looked back: "The process is not important. “

After saying that, he reached out to the staff and took the clues that belonged to them.

The blue team saw that the important clues fell into the hands of the red team, and they were a little anxious, and Sotu immediately said: "Of course the process is important, or let's make a bet, if you tell us the process of solving the problem, we will send a clue to the red team for free, if you can't say it, I will answer and obtain this clue." “

This is what Ren Shuai was waiting for, he just said that the process is not important, he just wants to fish.

"This, it's not good, we're taking important clues, you only have ordinary clues, it's not cost-effective."

Ren Shuai shook his head and waved his hand, looking unhappy, and made a gesture to leave.

Suo Tu suddenly got on the trap, took a step forward and said: "Then two clues, this is always okay." “

Ren Shuai continued to shake his head.

Mu Xiaoqing, Cui Zixun and Qiu Yun saw that he didn't agree, and thought that Mr. Li was confused, and he couldn't tell the process of solving the problem, so he couldn't take this bet.

The three of them hurriedly helped.

"Teacher Li is right, we don't bet."

"It's not a good deal at all, don't bet, don't gamble."

"Don't covet our important clues."

Seeing the behavior of several members of the red team, Suotu became more and more determined that Ren Shuai was answered.

He hurriedly took out a heavy note and said, "How about we bet all the four clues on hand?" “

When Ren Shuai heard this, he smiled secretly in his heart, but he couldn't agree too easily, lest the other party regret it.

Seeing that he was hesitant, Suo Tu simply said with the agitation method: "Should you be, you just don't know the process at all, right?" “

Ren Shuai's acting skills exploded, smiled awkwardly, and excused: "There are still three people in your team, you bet so much, can people agree?" “

As soon as the words fell, the other three led by Ah Fan hurriedly nodded and said: "We can afford to gamble, this is the clue, it is all here, if Suotu loses, you will all take it." “

As they spoke, several people pulled out four gray envelopes.

Mu Xiaoqing and the others saw that Ren Shuai was driven to the shelves, and they were afraid that they would not be able to agree if they didn't agree, so they were anxious for him.

Before she could take action, Ren Shuai sighed and nodded helplessly: "Okay, I'm really reluctant to do it, I don't want to pit you." “

Suo Tu smiled happily and said, "Then you can tell me, why is it A?" “

After putting away his helpless gaze, a subtle smile appeared on the corner of Ren Shuai's mouth.

Mu Xiaoqing and the others sighed one after another, feeling that the clue in their hand was about to fly.

This is their only hope of turning the tables, and after watching this morning's game, it is a loss.

At this time, Ren Shuai said with a straight look: "First of all, A, B, and C are mentioned in this question, so the battle combination can only be AB, BC and AC, so we can know the total number of rounds of the three-person battle."

It is known that C has been a referee 7 times, so AB's battle is 7 rounds.

A played 17 rounds, so it can be seen that AC played 17-7, which is 10 rounds.

C participated in a total of 25 rounds, and the BC battle was 25-7 equals 18 rounds.

To sum up, the game has been played for a total of 35 rounds, so the following questions are simple. “

Ren Shuai finished speaking in one breath and looked at Suotu.

The others showed an unclear expression, feeling that Ren Shuai's speech was clear and logical.

Sotu also found that he underestimated his opponent, but he would not be frightened by Ren Shuai's words.

He has already calculated these steps before, and the key is to see how to judge the referee of the 5th round later.

Ren Shuai said "It's easy later" and tried to get by, but he couldn't escape his eyes.

"Please tell us more about the next steps." Suotu said without letting go.

Ren Shuai looked at him with some surprise and said, "The back is middle school-level mathematical reasoning, everyone here must be able to, still use me to talk about it?" ”

Others were embarrassed.

This is really not Ren Shuai Versailles, he really thinks so.

Suo Tu touched his nose with a slightly dark face, he was also a quasi-top student who graduated from a prestigious school, and he couldn't afford to lose this person.

But the matter has come to this point, and Ren Shuai can't be easily let go.

"You'd better talk about it."

Ren Shuai was a little surprised, but he still explained: "According to the known conditions, although it is impossible to find out who the referee is in the fifth round, there are winners and losers in each round, and it is impossible for any consecutive two rounds of battle to be the same two people."

There are a total of 35 rounds, and BC accounts for 18 rounds, so the beginning and end must be BC, separated by AB and AC in the middle. ”