Mo Yue smiled and said, "Oh my god, from the seven numbers, randomly pick out six, and arrange and combine them. How many combinations are there?"

Lu Fei smiled, "Actually, this is a very simple math problem. This problem involves the knowledge of permutations and combinations in mathematics textbooks. Of course, the little **** in our story, they haven't read many books at all. All of them have not graduated from junior high school, and some even dropped out of elementary school. Obviously, they can't calculate how many combinations can be made by randomly extracting six from the seven numbers."

Demon Yue laughed loudly, "It seems that listening to your tone, you seem to know how many kinds of combinations result."

Luffy smiled, "Yes, of course I know, but the result of this combination is not like the little guy said, there are infinite possibilities. In fact, there are specific numbers. And, even this group The **** tries the combined numbers one by one, and it may not be possible until the homeowner comes back."

Moyue smiled bitterly, "Really? I really can't see, you can't calculate the specific number, right."

Luffy smiled, "Yes, anyone who knows a little bit of mathematics will know that this kind of permutation and combination has a fixed formula that can be calculated. If each digit is not repeated, it should be 7x6x5x4x3x2x1= 5040. That is to say, there are five thousand and forty combinations for this seven-digit number and six optional combinations."

Demon Yue smiled bitterly, "Sure enough. I worked out the specific number immediately. Admire it."

Luffy smiled and said, "I admire it. This question is a very simple math problem. Just put the numbers in the formula and calculate it again."

Mo Yue smiled bitterly, "Really? It's that simple?"

Luffy smiled and said, "Yes, oh, yes, don't you say that our human knowledge is useless? You also said that we learned it for nothing. But now, this simple math problem, I am not very smart Humans can calculate it, and you claim to be a great demon, huh? Ahem, that, you should be said to be the son of the devil, but you don’t know how to calculate. It’s embarrassing. It seems that you practice magic, even if you can It’s so funny that you can master the magic, but you can’t even calculate a simple math problem. On the contrary, I, a human being regarded as a low-level creature by you, have calculated the specific number. I will tell you. This kind of math problem is a piece of cake for our human middle school students. It's too simple. Middle school students from any school can calculate it."

After Luffy finished speaking, he held his belly and laughed.

The devil was choked and babbled for a long time before he stubbornly said, "This kind of mathematics problems are all made by you, so you humans can naturally calculate them. When I was studying, I only learned magic arts. What math problem?"

Luffy smiled and said, "Well, this time you must admit that we humans also have advantages over you, and the knowledge we humans have learned is not useless."

Mo Yue smiled and said, "This time, count you as reasonable. Okay, you should continue to tell the story. Otherwise, talk about it again, when will you be a head."

Luffy smiled, "Okay, I will continue to tell the story. My elder brother smiles bitterly, yes, although I am not very good at studying, I can't figure out this kind of seven-number questions, and then randomly combine them. , I can also feel that there should be many possibilities. Everyone listened, almost desperate, and said in unison, God, what can we do? Is it possible that we just keep trying? My elder brother smiled bitterly, I too It’s not good. The little guy laughed triumphantly. Look at you, your mind is full of paste. What I tell you is the truth. Not only did you not believe me, but you beat me? What do you think? Do you guys have no brains? Although this time, the little man laughed arrogantly, but no one came forward to beat him. The reckless teenager whispered, brother, if we really put those huge numbers of combinations all together one by one Try it again, won’t you really be unable to find the password until the host comes back? My elder brother shook his head again, don’t ask me any more, my mind is messed up now. I feel that this way of trying one after another is nothing It’s different from finding a needle in a haystack. The little guy nodded, yes, I think so too, but now, what should we do? My elder brother shook his head, don’t ask me, I have no idea now. The little guy looks at everyone present, and then Looking at the safe embedded in the wall, he opened his throat and shouted, I said you, so many of you, but say something, this kind of thing, we all have to find a way together, don’t always point to the big brother alone. I know he is very clever and has many ideas. However, he is just a head. After all, his thinking is limited. Don't always wait for him. You should also use your mind and think about how to open this safe. Otherwise, now everyone speaks one by one, and everyone expresses their own views. Now, all the thieves present are dumbfounded. They all look at me and you, and no one will stand up. Indeed, these Because of their young age, the children have almost nothing to think about, and they never think about anything. They just live so dumb and sleepy every day. One day counts as one day. They can’t tell if they want to let them express their opinions. That's why. The little guy snorted when he saw it. How did you do it? Didn't you guys be very active just now? Beat me together, it was very exciting. What is going on now? Let you stand up and everyone say something Then, don’t you all dare to stand up? Everyone bowed their heads and dared not look at the triumphant eyes of the little man. The little man smiled, come on, you all talk? My elder brother smiled bitterly, and I said, you should just forget it. Don’t force them anymore. They are still just a bunch of kids after all. They don’t understand anything. They have neither their own ideas nor their own opinions. The little guy laughed, I understand. They have always listened to you. Now, you don’t They had no idea at all. My elder brother waved at the little man impatiently, frowned and said, that’s enough, don’t make any noise anymore, let me calm down and think carefully, what should I do next After all, we took the chance and came in over the wall. If we can’t open this safe, wouldn’t it be regrettable forever. The little man nodded and made sense. If this time we don’t To be able to open this safe, I believe that I will remember it for the rest of my life. Many years later, I will never forget it. When I was twelve years old, I stepped over the wall and entered a villa and found the owner’s safe. , But, because I can't open the box, and all previous efforts have been abandoned, the pain of this failure is estimated to torture me for a lifetime. "