An intellectual question about table tennis, is it a puzzle to play table tennis?

This question is so difficult???

There are three groups: A, B, and C

For the first time, AB said, balance: take three out of C and compare with any three in AB, balance is not to say, if it is not balanced, the bad one is in the three in C, marked as , and already know whether it is heavy or light, and then just take two of the three of them to compare it is OK.

The first imbalance: we assume that A is light and B is heavy (A is heavy and B is light), and then A is marked as 1, 2, 3, 4 B, 5, 6, 7, 8, 8 C is marked as 9, 10, 11, 12. If 1567 is heavier than 8, 9, 10, and 11 groups, it means that the bad one is in 567 and is heavy, and there is another time to weigh which one; If 1567 is light, it means that the bad is in , and the last time it can be done; If balanced, that is to say the bad one is in 234, and the ball is light, the last time it is done.

Divided into three groups of A, B, C, 4 in each group, first take AB on both ends of the balance, if balanced, defective products in Group C, so divide C components into four groups, (1 step) E, F, G, H, one for each group, E, F on the balance, if it is unbalanced, then take G to replace F, balanced, defective product is F, or unbalanced, defective product is E. If E and F are balanced, the defective product is in G and H, and if G is replaced with F, if it is unbalanced, G is the defective product, and if it is balanced, H is the defective product.

Divided into three groups of A, B, C, each group of 4, first take AB on both ends of the balance, if it is unbalanced, replace C with B, if balanced, the defective product is in B, and then B according to the steps of 1, you can do it.

Divided into three groups of A, B, C, each group of 4, first take AB on both ends of the balance, if it is unbalanced, replace C with B, or unbalanced, the defective product is in A, and then put A according to the steps of 1, you can do it.

Right?

First, 6 on one side. Then, on the side where the weight is taken, there are 3 more on one side, and finally only 3 remain. Then, take out 2 of the 3 and put them on the heavy side of the scale, which is what you are looking for. If it's the same weight, then, the rest is what you're looking for!

Start by dividing into two groups and placing them on both sides. The heavier group is divided into two groups and put them on both sides. And so on, to the last group there are three, put two to both sides first, if equal is the other one that is not equal, it is the heavy one.

Divided into three groups of A, B, C, 4 in each group, first take AB on both ends of the balance, if it is unbalanced, replace C with B, or if it is unbalanced, the defective product is in A, and then A is operated according to the steps.

Divide the ball into four groups: A, B, C, and D. 3 balls per set.

If they are balanced, it means that the ball in question is in group C or D. Then measure the two groups A and C, and if they are balanced, it means that there is a problem in group D. Group D randomly took out two balls to test, and the balance showed that the problem was the remaining ball.

If the two groups of AB are not even, then measure the two groups of AC, if it is balanced, it means that the ball in question is in group B, and the ball can be found by using the same method as above.

If the AB is balanced and the AC is unbalanced, the ball in question is in group C.

By the difference between the height of the problem group and the normal group, we can determine whether the ball in question is heavy or light. This condition can guide the following judgments.

Playing table tennis puzzles.

Playing table tennis makes people smarterIn various fitness activities, playing table tennis is a ball game that integrates strength, speed, flexibility, activity and endurance. Table tennis is very simple to learn, and it is not bound by location, age, etc. The biggest benefit of this exercise is that it can make people's brains smart and enhance memory.

The results show that these small sports are widely reflected in the high level of intelligence, the operational ability is better than that of ordinary students, emotional stability, self-confidence, independence, and mental agility, and the intellectual elements and characteristic elements are harmonious.

In normal times, they also tend to be alert, agile and harmonious. Playing table tennis is the best exercise for the brain. Studies have confirmed that regular participation in this sport can improve a person's nervous system and reflexes.

When playing table tennis, due to the small ball, fast speed, quick change of attack and defense, and rich and diverse skills, it is necessary to ask the brain to consider quickly and seriously, and use both hands and brains to improve the brain's judgment and response ability. Therefore, Chang Lu often participates in this exercise, which helps to promote the blood circulation of the brain, ** the abundant energy of the brain, and has an excellent brain strengthening effect.

Precautions for playing table tennis

1. Conduct environmental inspections.

The table should be spacious around the table, and there should be no obstacles too close to avoid injury during the sport; The ground should be dry, and the water should be dragged dry in time to prevent slipping and injury.

2. Prepare for the event.

Before exercising, some special exercises should be done, such as jogging, freehand exercises to accompany the jujube guessing, in order to move the joints, belts and muscles, so that the human body can adapt to the requirements of table tennis.

3. Control exercise load.

For middle-aged and elderly people, competitive competitions should be avoided, because with the intensification of the degree of competition, the intensity of exercise will also increase a lot, which may have adverse effects on people with weak heart function, and should be paid enough attention.

A ping-pong ball, no matter what direction it is seen, is a circle

So the answer is: circle

Round 1 Round 2 Round 3 ...Round 7 (Final).

This is the 1st position fixed counterclockwise rotation method (there is no 1-2 in the last round3—4；5—6；7—8）

If you have learned permutations and combinations, it is very easy, 20 teams pick 2, Tong is the first and do not repeat, that is, 20 * 19 2 = 190, that is, c20 2 Because lazy simple potatoes use mathematical formula software, so the symbol is a bit weird.

If you haven't learned permutations and combinations, you can also count them, so you can choose a team with 19 games, and if you choose the second team, you have to play 18 more games, and so on, that is, 19 + 18 + 17 + ......2+1=190

According to the above analysis, divide 100 into a group of 6, the remainder is a few, I will take a few first, 100 6 = 16 (group)....4 (pcs).

A: I take 4 first, he takes n out of 1 5, I take 6-n, and so on, to ensure that I get the 100th table tennis ball

Step 1: Divide the nine balls evenly into three parts, 3 parts each, take any two parts and put them at both ends of the balance If balanced, take the remaining three for the second step analysis; If there is an imbalance, the lighter three are taken for the second step analysis

Step 2: Divide the three balls into three parts, 1 for each part, and put any two of them at both ends of the balance If balanced, the remaining 1 is defective; If it is not balanced, it is a defective product

Weigh the balance at least 2 times, it is guaranteed that you will be able to find out the defective product, so the answer is: 2