"Note that you'd better not take a question that has no answer or that you don't know the answer. If you can't answer the question you ask yourself, it means you lose, that is, you are not qualified to be recognized by Ravenclaw. If I don't answer the question you ask within five minutes, it means I lose, and then I mean Ravenclaw admits your wisdom."

The Eagle Door Knob finished its rules and announced: "You can ask questions now."

Instead of immediately trying to ask questions, Lynn stood there and thought calmly.

The Eagle Door Knob was created by Ravenclaw. Its wisdom in making riddles is equivalent to reaching the extreme, and the ability to solve puzzles is the same as the ability to make riddles.

But this so-called ultimate can only represent the ultimate of Ravenclaw alone, which means that the level of solving the puzzle of the Hawk Door Knob is similar to that of Ravenclaw himself.

Moreover, this door knocker has not been self-consistent. The things and theories I understand only stayed a thousand years ago. It obviously has any channels for understanding the changes in the outside world, otherwise it would not have been possible that the same question had not been asked in nearly a thousand years.

Although Lin En was a teacher in his previous life, he was just a Chinese teacher who just started working. He was not interested in riddles and other things, and he didn't know much about some difficult questions on the Internet. It was not a simple matter for him to ask a question that the Eagle Door Knob could not guess.

The rules of door knockers blocked his chance to ask some unsolved mysteries of the world (in fact, even if he could ask, he wouldn't remember what the various unsolvable questions were. Unless he was professional, who would remember this when he was idle?).

He thought for a long time, but the Eagle Door Knob did not urge him. Finally, Lynn decided to ask a question I had seen online first to try it out.

"If 1=5,2=15,3=215,4=2145, then how much is 5=?"

The door knocker eagle did not hesitate when he heard Lynn's problem, and it said without hesitation.

“5=1.”

The first question ended. The door knocker Hawk did not get into Lynn's trap, but he was not frustrated. After all, it was just a question of opportunism to test the waters, and Lynn did not have much hope.

"You have two more chances." The door knocker said coolly. It was not a ruthless riddle machine. It was obvious that when Ravenclaw created it, he also gave it emotions, allowing it to experience pride and satisfaction.

Lynn frowned and thought carefully.

This door knocker also thinks the same as a human, but it is sensible enough to avoid the vast amount of fog attached to the surface in the riddle. That is to say, those riddles similar to brain teasers are not difficult for it at all.

A person's way of thinking is beneficial and has great flaws.

Lynn pondered for a long time, and suddenly he came up with a question, but before asking this question, he still needed to confirm something from the door knocker.

"Is your brain given to you by Ravenclaw, exactly like an ordinary person, a human brain rather than a machine?"

"If you want me to answer, this will also use up the opportunity for a question."

Lynn didn't care about it. If he confirmed this and the problem that could not stump the Eagle Door Knob, then he would be completely helpless. Whether there is still a chance for him is the same.

"Can."

"Of course my mind is exactly the same as humans, but I am the same as my master Royna Ravenclaw, the wise man among humans. That is to say, it is smarter than normal people. As for machines? How can machines have brains? That is a dead thing."

The door knocker said proudly, as if he was proud of his ability to have the same wisdom as his master.

Lin En immediately felt confident that since the calculation method of the door knocker Eagle is still the human brain, he will definitely win this time.

He smiled on his face and gave a math problem to the door knocker.

"How many five-digit numbers are composed of ten numbers 0,1,2,3,4,5,6,7,8,9? How many five-digit numbers are there in total that contain three odd numbers and two even numbers?"

This is the only high school math problem that Lin En remembers. Because he was sick for a while and missed classes, he listened to a few sessions of the arrangement and combination solutions and formulas taught by the math teacher, which caused the monthly exam to fall from the first place in the class. So later he made up for a few knowledge points and wrote this typical example on the first page of the wrong question book. As long as he opened it, he could see it at first glance, so he never forgets it until now.

The eagle door knocker was silent.

The first time it heard this question was to try it one by one, and to try out how many numbers there were. However, before it could even begin, it was desperate to find out that with so many possibilities, he would never be able to solve the problem within five minutes!

Even if the door knocker eagle can keep up with the times, it is limited to the magic world, and no one in the magic world has learned the mathematical problem of arrangement and combination.

Even the little wizards who were born in Muggles said that they would say goodbye to ordinary society after they were 11 years old, and they had no chance to get involved in this part of the mathematical content.

It thought silently for three minutes, but still found no confusing information in the question. It seemed that this thing would not have the answer except listing one by one.

"You've been fouled!"

The door knocker said with certainty, "There is an answer to this question, but no one can tell the answer within five minutes, even five hours!"

Lynn looked at the door knocker with a smile, knowing that he had won.

"I can calculate the answer for you now. There are 11,040 numbers that meet the criteria."

The door knocker eagle fell silent again, and for a moment it could not tell whether the answer given by Lynn was right or wrong.

"How did you get the results? Count them in advance?"

"Who will count this without any trouble? This is a mathematical problem. As long as you learn formulas and methods, you can easily get the results by putting the numbers in."

Lynn looked at the door knocker eagle who was confused about what he said, knowing that it had not received modern education and could not understand what he said.

"What if you can't be sure if the answer I said is correct? Who wins this?"

The door knocker hawk was struggling for a long time, and finally it said: "I have a way to judge whether you are right or wrong, but it takes time."

Lynn was shocked when he heard it: "You wouldn't plan to use your brain to list all the numbers one by one?"

"To verify whether your answer is correct, of course you have to do this."

"But how long will it take for you?"

The door knocker eagle estimated it and said hesitantly: "It should take about five days."

"How do you use your brain to determine that the numbers in the column will not be repeated?"

"I have my own way."

Seeing that this was a terrible thing, he wanted to personally verify whether the number Lynn said was right. He felt like shooting himself in the foot.

"There is no other way?" he asked unwillingly.

But this stupid eagle is just saying that: "I have to verify your answer myself, otherwise I will not recognize you."

"It's up to you."

Lynn had no choice but to only five days. It’s September 14th, and five days later it’s the nineteenth.
Chapter completed!