For about 13 years, there were dozens of people on a problem, and now I know why there is no one?

Because I know that the more I revise, the more unsatisfactory it becomes.

First, your problem may not be simple, second, your bounty is too small, and third, the system covers the problem too quickly, and it is covered by a new problem before you can see it!

There is no reward, the problem is too biased, the character is not good, whatever you think.

The questions you asked were too deep and too difficult. Or when everyone is eating and sleeping.

It's normal. The question is too boring.

If there is a reward, there will be more people who answer the questions.

Explain that the person is not interested in your question.

Because you're not a woman, because you're not pretty.

Your question is difficult. A lot of people don't.

If you adopt me, I'll tell you the secret.

Number the twelve balls as 1 12.

Place 1 4 on the left side of the scale and 5 8 on the right.

There are three outcomes:

One. Balance. Illustrating the problem is 9 12.

Put 1 3 on the left and 9 11 on the right.

There are three outcomes:

1.Balance. Explanation No. 12 is problematic.

Put number 1 on the left and number 12 on the right.

If the left is heavy, the number 12 is lighter, and the right weight is the number 12. It is impossible to balance.

2.Left weight. Illustration 9 11 has a ball that is light.

Put number 9 on the left and number 10 on the right.

The left weight is 10 lighter, the right weight is 9 lighter, and the balance is 11 lighter.

3.Right weight. Note 9 11 has a ball that is heavy.

Put number 9 on the left and number 10 on the right.

The left weight is 9 heavy, the right weight is 10 heavy, and the balance is 11 heavy.

Two. Left weight. The explanation of the problem is 1 8.

Put 1, 5 7 on the left and 8 11 on the right.

There are three outcomes:

1.Balance. Note 2 4 has a ball that is heavy.

Put number 2 on the left and number 3 on the right.

The left weight is 2 heavy, the right weight is 3 heavy, and the balance is 4 heavy.

2.Left weight. Indicate that No. 1 is heavy, or No. 8 is light.

Number 1 is placed on the left and number 2 is placed on the right.

The left weight is heavier than No. 1, and the balance is lighter than No. 8. It is impossible to weigh right.

3.Right weight. Description 5 No. 7 has a ball light.

Put number 5 on the left and number 6 on the right.

If the left weight is 6 lighter, the right weight is 5 lighter, and the balance is 7 lighter.

Three. Right weight. The explanation of the problem is 1 8.

Put 1, 5 7 on the left and 8 11 on the right.

There are three outcomes:

1.Balance. Illustration 2 4 has a ball that is light.

Put number 2 on the left and number 3 on the right.

If the left weight is lighter, the number 3 is lighter, the right weight is lighter than the number 1, and the balance is lighter than the number 4.

2.Right weight. Indicate that No. 1 is light, or No. 8 is heavy.

Number 1 is placed on the left and number 2 is placed on the right.

The left weight is lighter than No. 1, and the balance is heavier than No. 8. It is impossible to weigh right.

3.Left weight. Note 5 No. 7 has a ball that weighs.

Put number 5 on the left and number 6 on the right.

The left weight is 5 heavy, the right weight is 6 heavy, and the balance is 7 heavy.

There is no solution to this problem, and 3 steps are not enough to judge.

This question, seemingly simple, is actually quite complex, and the following is the copied answer:

Make 12 balls 1,2....No. 12, the following names can be designed:

Left Disc **Right Disk.

First 1,5,6,12 **2,3,7,11

2nd 2,4,6,10 **1,3,8,12

3rd 3,4,5,11 **1,2,9,10

There may be three outcomes of flat, left, and right weight each time, and there are a total of 27 results when combined, but the results of flat, flat, and flat will not appear, because there is always one ball that is not equal. Similarly, left, left, right, right, right and right results do not come back, because according to the design of the notation, no ball is on the left or right three times. The remaining 24 results can determine which ball is in which case.

For example, if the result is a draw, a draw, a left, or a draw, a draw, or a right, you can judge that it is a ball 9, because there is no ball 9 in the first and second times, but there is a ball 9 in the third time, and the first and second balls are both flat, and only the third ball is unbalanced, indicating that the weight of ball 9 is different from other balls. Based on this principle, it is possible to determine which ball is in each other situation.

There are 12 balls, and the bad ball can be lighter or heavier than the good ball, so there are a total of 12x2=24 possibilities, and the 24 possible results are as follows:

Possible Outcome Possible Result

Ball No. 1, and heavy left, right, and right No. 1 ball, and light right, left, left.

Ball 2, and heavy right, left, and right Ball 2, and light left, right, left.

Ball 3, and heavy right, right, left Ball 3, and light left, left, right.

Ball 4 and draw, left, left Ball 4, draw, right, right.

Ball No. 5, and heavy left, flat, left No. 5 ball, and light right, flat, right.

Ball 6, and heavy left, left, and flat Ball 6, and light right, right, flat.

Ball No. 7, and heavy right, flat, flat Ball No. 7, and light left, flat, flat.

Ball No. 8, and a draw, right, and a draw Ball No. 8, and a light draw, left, and a draw.

Ball No. 9, and heavy draw, draw, right Ball No. 9, and light draw, draw, left.

Ball 10 with a draw, left, right Ball 10 with a draw, right, left.

Ball No. 11 with heavy right, flat, left Ball No. 11 with light left, right, flat.

Ball 12, and heavy left, right, and flat Ball 12, and light left, right, flat.

None of the above 24 results are repeated, and the above results can also be reversed as possible, or the only ball can be pushed out as a bad ball, proving that this method is feasible.

Divide the ten balls into three parts and set up part A, part B, part C, first called A and B 1: Balance of Scales.

Then the bad ball is in C, divides C into four parts, and weighs it twice, so you can judge 2: unbalanced.

You can judge which part is divided into four parts, and then weigh it twice, and you can judge that you want to be satisfied.

Divide the twelve balls into three parts. Four per serving. The two parts of the task are called.

There are two possible scenarios. One is equal in mass and the other is unequal in quality. Respectively, let's say a first. Cases where the quality is equal.

a。The quality is equal. Then in that ball is in the remaining four balls. Take three of those four. and three normal ball ratios. If it's the same weight. It was the last ball. Compare it with the other one to know the result.

If it's not the same weight, it's in those three balls, and you know whether it's heavy or light. Just take two comparisons and you're good to go.

b. When the quality is not the same. It's in those eight balls.

It's a bit of a hassle to say, but it can be done.

No one will do it, because 3 times, it is impossible to measure.

See, no one answered because your question was too difficult, and others didn't know how to answer.

Do you have such a person in your life, do you remember him?

Zhi's name, dao remembers his eyes, and remembers what he said to you. But Rong Du didn't remember what the reason was, and they lost each other while walking. Whenever you think of this person, you feel pity.

In the vast sea of people, we finally met, how can we be willing to say that we will disperse.

Maybe your question is too vulgar, too mundane, and meaningless in real life, or maybe your question is too high-end and too professional, so your friends laugh it off.

The higher the bounty amount, the higher the click-through rate.

The question is not too difficult to reply, or is it suspected of violating the rules, or there are sensitive words that you have blocked.

What you're asking might be too boring.

Probably not, or for some other reason.

First of all, you need to understand the main point of the questioner's question, and then answer it step by step.

It's best to hit the nail on the head so that the questioner can see it at a glance.

It's okay to answer directly under the question.、If you answer the question, it depends on the time you post and the reward.、In addition, don't worry, the more people who will answer this question, the more people will answer, and the system will also distribute it to those who can answer after a long time.。

The question can be simplified or split, and it is best to have a reward for points.

Learn to ask questions first and ask some valuable questions.