At this time, Xue Yan took out a formation diagram, and the formation was sealed in the formation diagram.

If you can solve a math problem, you can open the sealed formation in the array.

Xue Yan took the formation diagram and smiled at Zhang Hong: "This formation, the Tianxuan Great Sword Formation, was created by my master's real person, and it is sealed in this array." ”

"It seems that this formation is very strong!" Zhang Hong asked.

"Of course, my master is a formation refining master, and this formation cost my master a lot of effort. If this formation is laid out, those children of the Qiao family who came here will have to die here. Xue Yan said.

"It's just that the magic weapons and formations refined by my master like to be sealed with mathematical puzzles, and only by solving the arithmetic puzzles on this formation can this formation be opened, so although our senior brothers and sisters have master's treasure, they are also a little helpless. Mu Tang said.

"I wonder what this arithmetic puzzle is?" asked Zhang Hong.

"The arithmetic puzzle is on this diagram. Xue Yan said.

When Zhang Hong heard this, he saw that there was an arithmetic problem written on the formation diagram.

"Today, there is a Tianxuan Great Sword Array, more than a thousand sword weapons, two of the three or three numbers, three or five of the remaining three, and two of the seven and seven numbers, how many sword tools are in the sword array?"

Zhang Hong took a look at the question and had a general understanding of the question.

The meaning of this question is that there are more than 1,000 sword weapons in this sword array, and the number of sword weapons is divided by three remainders to be two, divided by five remainders is three, divided by seven remainders is two, and the number of sword weapons in the sword array is found.

Seeing this question, Zhang Hong was stunned, and immediately reacted.

Zhang Hong looked at the problem and thought: This problem, if placed in modern times, can be understood as a function problem, also known as a unary linear congruence equation.

Such a question is more difficult than those questions of the equal ratio series, but for Zhang Hong, it is nothing, after all, Zhang Hong also participated in the Olympiad in high school before.

Zhang Hong immediately took out a branch and scratched it on the ground.

According to the known conditions of the problem, find the minimum same remainder 23, and then find the least common multiple of 375 105, then you can list the function equation: f(n)=105n+23, so that you can get the results that meet the conditions, in order, 1073, 1178, 1283, 1388, 1493, 1598, 1703.1808, 1913.

Zhang Hong wrote all these results on the ground.

"Solved, these numbers are the answer. Zhang Hong said.

"Zhang Hong, are you sure there are so many answers?" Xue Yan asked.

"Of course, is there a problem?" asked Zhang Hong.

"There is only one answer to this sword formation!" Xue Yan asked.

Then this answer is one of them. Zhang Hong said.

"Zhang Hong, I'm not afraid to tell you that to open this formation, everyone only has two chances to calculate the problem. Xue Yan said.

"That's right, if anyone miscalculates, they will have no chance with this formation. Mu Tang said.

In other words, if anyone opens this array, the spirit of this array will coincide with whose mind, and this array will belong to whomever it belongs. Xue Yan said.

"In this way, if I open this formation, won't this formation belong to me?" Zhang Hong asked.

"It's just that there are only four of us, which is eight chances to open the formation map, and here we have nine eligible answers. Xue Yan said.

"We're not going to be so unlucky, eight chances to find the right answer out of nine should be fine. Zhang Hong said.

Hearing what Xue Yan and Mu Tang said, he looked at the instructions on the formation diagram again, and Zhang Hong could be regarded as understanding the general situation of this formation diagram.

"I'll come first!" Xue Yan said.

As Xue Yan spoke, he chose a number 1388, and this number 1388 was like a key to open the formation.

Xue Yan's mental power hit, reciting 1388 in his mouth, trying to open the formation diagram, but found that the formation diagram did not respond at all.

Xue Yan shook his head, a little disappointed, and immediately chose another number, 1493, trying to open the formation.

Xue Yan's eyes were full of hope, but when he opened the formation, the formation still didn't move.

After two attempts, Xue Yan's opportunity ran out.

"Looks like I'm not lucky! I failed both times. Xue Yan said.

"I'll come!" Mu Tang said.

Each person has two chances, if these two chances don't open the formation diagram, this formation diagram will be lost in this life.

Therefore, Xue Yan has no chance with this array in his life.

Mu Tang immediately picked a number 1178, and immediately comprehended the array diagram with his kinetic power, and the array diagram did not move at all.

Seeing this, Mu Tang was a little disappointed.

Mu Tang shook his head and picked another number, 1703.

Mu Tang once again controlled his mental power and used 1703 to perceive the array, but the array was still unmoving.

Mu Tang shook his head again and said, "It seems that I also have no chance with Master's formation!"

Xue Yan and Mu Tang tried to manipulate the formation diagram, but they also failed.

At present, if you want to open the formation diagram, it can only be Zhang Hong and Feng Shopkeeper.

"Mr. Zhang Hong, Shopkeeper Feng, everyone has two chances to open the formation diagram, but I'm afraid that if you want to open the formation diagram, it can only depend on the two of you. Xue Yan said.

"That's right, each person only has two chances, who will come between the two of you?" asked Mu Tang.

"Mr. Zhang Hong, come on!" shopkeeper Feng glanced at Zhang Hong and said.

"Then I'll come first! I feel so stressed!" Zhang Hong smiled at Shopkeeper Feng, and then looked at Xue Yan and Mu Tang.

Zhang Hong looked at the remaining five numbers on the ground, and said, "Then I'll choose the largest number!"

Zhang Hong took the formation diagram from Mu Tang's hand, and immediately moved his mind, and a number of 1913 seeped into the formation diagram in his mind.

The number 1913 in this mind is like a key inserted into a keyhole.

"Click!"

There was a slight sound, and Zhang Hong vaguely felt that the key had opened the lock.

At this moment, there was a light on the array.

Soon, one after another, sword weapons began to levitate from the array.

"Is this the opening of the formation?" Zhang Hong was also stunned when he saw this situation.

"That's right, the formation has been opened. Xue Yan said.

"Unexpectedly, the answer to open the formation is 1913!" Mu Tang sighed.

"So what should I do now?" asked Zhang Hong.

Zhang Hong has no experience in how to manipulate the formation.

"Brother Zhang Hong, there is actually no difficulty in controlling the formation, as long as you perceive the formation with your mind, you can control the formation. Xue Yan said.

"In that case, I'll try. Zhang Hong said.

Zhang Hong relied on his mind and his mental power to move, and the 1913 sword flew up.

Zhang Hong's every thought was like a command.

"Brother Zhang Hong, let the formation be laid down. Xue Yan said.

"Well, I see. Zhang Hong nodded.

In an instant, one after another sword formations fell, all of them penetrated into the soil.

In this way, the formation is laid out.

"Now, all the sword weapons have fallen into the soil, and the formation can be regarded as a success!" Zhang Hong said.

"That's right, the sword array fell into the ground, it is considered a successful formation, and when the time comes, when the enemy arrives, as long as the mind moves, the sword array will rush out of the soil, so as to attack and kill the enemy. Xue Yan said.

"Brother Zhang Hong, now, it is you who have opened the formation, but I am afraid that this formation will be handed over to you in the future. Mu Tang said.

"Give it to me?" Zhang Hong was taken aback.

"Of course, because you opened this formation, your mind is connected with the spirit of the formation in the formation, and in the future, only you can control this formation. Xue Yan said.

"Since the two of you are so polite, then I am not welcome. Zhang Hong said.

"Brother Zhang Hong doesn't need to be polite to us, we still have a lot of problems to help us in the future!" Xue Yan said.

"A lot of problems?" Zhang Hong was stunned.

"Actually, I'm not afraid to tell Brother Zhang Hong that our master has left us a lot of treasures, but many treasures have set up arithmetic problems as an obstacle to opening the formation. Xue Yan explained.

"Brother Zhang Hong is an arithmetic wizard, in the future, our senior brothers and sisters will have to rely on you. Mu Tang said.

"Brother Zhang Hong, as long as you help our senior sister and brother, you will definitely get a lot of benefits in the future, and this formation diagram in front of you will be given to you. Xue Yan said.

Zhang Hong's system accompanies him, and he has no interest in other people's things, but they insist on giving this array to themselves, and they can only keep it.

After all, walking in this world of cultivating immortals, every step is extremely dangerous, Zhang Hong just has a system, it is not enough, if he can have such a formation body, there is also an extra hole card.