After two days on June 12th and 13th, all six subjects of the examination ended smoothly, and all six subjects were above 80 points, which is proper!

After the entrance examination, I made up for the last monthly exam, so I had a holiday on the 14th and 15th. The end time of the last subject is four o'clock in the afternoon, many students who are closer to Frost City go home after the exam, Ye Liangchen's home is about 30 or 40 minutes' drive from the city, there is no car at this time, but this is in line with his heart, anyway, he hasn't figured out how to face that home.

Coming out of the examination room, Ye Liangchen, Fat Man, and Jiang Hai met Kong Baocai, who was also taking the exam here, at the gate of the No. 3 Middle School, and the Fat Man went to the game hall to play.

The fat man could have gone home, but Ye Liangchen helped him a lot in this exam, not only gave him the small questions of choosing and filling in the blanks as discussed by the two of them, but also gave a lot of big questions.

So I have to say that the idea of a foodie is very simple, he is going to invite Ye Liangchen to have a meal in the evening, of course, this meal is obviously not enough, but it doesn't matter, if you go home tomorrow, as long as you report to your father and pass the exam, plus the second-to-last result of the monthly exam, the silver will definitely be a lot of money. It just so happens that his birthday is approaching, and then the whole decent party will be a good thank you.

Tiezhong is in the north of Dao, and the third middle school is in the center of the city, the famous trade city and the big world are the most prosperous commercial centers in the city, and the entertainment venues that are very popular in this era such as billiard halls, game halls, video halls, dance halls, roller skating cities, and singing rooms have everything.

The four of them quickly entered a game hall.

Ye Liangchen, a good baby, had never even touched the Xiaobawang game console before high school, but people always change. Since the first semester of high school and Kong Baocai got closer and closer, Kong Baocai tried to take him out to play, Ye Liangchen really refused at first, in his mind, only bad students would play this kind of thing. But the power of example is endless, and under the example of Kong Baocai, Ye Liangchen slowly integrated. But both of them are very restrained, just to relax and not be addicted, basically 1 or 2 times a month, one or two dollars each time, and slowly form a habit.

Liangchen said that he was no longer able to complain......

As soon as the four of them entered the game hall, the fat man actually threw off his fat body and rushed over to buy coins first, a small box full of more than 100, and Jiang Hai bought four bottles of soda when he saw this.

Hehe, no wonder they all like to be friends with local tyrants.

Street Fighter, 1945, Thunderbolt, Romance of the Three Kingdoms, Journey to the West......

I have to say that there is a specialization in the art industry, and the level of the fat man playing arcade machines throws a few people and a few streets, and only Jiang Hai can barely see it.

Playing until the shoulders were sore and the mouth was dry, there were still more than half of the coins left, Ye Liangchen and Kong Baocai's meaning was ready to withdraw, who knows, the fat man smiled mysteriously, and took them to a game console with colored lights and singing to sit down.

This game console obviously played differently in front, and I had seen others play in the game hall in front of the station (near the school) before, but Ye Liangchen and Kong Baocai never dared to go up to play.

This kind of game machine is of a gambling nature, and the full name is called Lucky Fruit Machine. I saw 8 buttons in the bottom row from left to right: BAR-50, 77-20, Shuangxing-20, Watermelon-20, Bell-10, Pear-10, Orange-10, Apple-5. There are 24 patterns around the screen: 4 apples, 2 oranges, 2 pears, 2 bells, 1 watermelon, 1 double star, 1 77, 1 BAR, 8 smaller patterns and 2 green and red GOODLUCK.

"Fatty, let's return the coins, this is a gambling machine," Kong Baocai said to the fat man

"I'm a treat, what are you afraid of, don't worry, if you lose, pull down," the fat man said with a grin.

"10 wheels per person, I'll proof" casually began to put coins.

The first one: bet on watermelon, and the bell is opened

The second handful: the watermelon and the apple

The third: still bet on watermelon, opened the green GOODLUCK on the right, and turned out to be an apple orange mango small {three} yuan

Fourth......

has been betting 10 handfuls of watermelons in a row, but they didn't hit, the fat man was a little depressed, so he asked Ye Liangchen to sit down, but Ye Liangchen gave it to Kong Baocai. Although Kong Baocai played for the first time, he obviously didn't want to learn from the fat man known as proofing, don't look at Baocai usually seems to be a little stupid when he learns, but he is not stupid to play, he is flexible and changeable betting, just like buying lottery numbers, most of the numbers from the previous period will not be repeated in the next period. So 10 actually guessed a bell, an apple and a 1/2 pear (that is, half of the odds of a normal pear is 5), a total of 10 coins.

When he asked Ye Liangchen to sit down again, Ye Liangchen still didn't sit down.

"Jiang Hai, you keep playing, I'll learn again."

After Ye Liangchen finished speaking, he took out a pen and paper from his schoolbag, and began to write on the paper......

"I'm cāo, my head is in the water, and I'm still studying in the game hall?"

"In addition to having a heart-eating eye, what else can you think about with such a big brain, you hurry up and bet your big watermelon"

Around 2010, as the video game city was reborn and then blossomed everywhere, the business in the video game city for 1 yuan and 1 coin was still booming. For example, the fishing that everyone can play, I don't know how many people are addicted, but Ye Liangchen likes to play a coin pusher called the Monkey King, and at most he has won more than 2,000 game coins at a time, and he must have lost far more than he won. All this kind of machine qì has a time period for eating and sending points, according to different settings, you will naturally know the rules after playing for a long time. Early slot machines from the late 90s were much simpler, and even a script written on a computer could be cracked if it was more serious.

I saw Ye Liangchen writing on the paper:

The probability of each opening: Apple 4/24, orange, pear, bell 2/24, watermelon, double star, 77, BAR, 1/24, GOODLUCK2/24, and the winning rate of the other 8 1/2 odds is 1/24 each. There is also 1 special case where GOODLUCK is LOST (just the fat man opened such a handful) without any rewards!

IN FACT, YE LIANGCHEN MADE A SMALL MISTAKE HERE, BECAUSE HE ONLY WATCHED MORE THAN 20 HANDFULS AFTER ALL, AND LATER CORRECTED THE MISTAKE WHEN HE PLAYED BY HIMSELF: IN FACT, GOOULUCK (GREEN) 1/24 AND RED GOODLUCK CAN ONLY BE OPENED AFTER BEING OPENED AS GREEN GOODLUCK, AND CANNOT BE OPENED ALONE. There are a total of 5 situations after the green GOODLUCK is opened: 1, and throwing out oranges, pears, and bells at the same time is called a small three-yuan; 2, throw out watermelon, double star, 77 at the same time called **; 3. Throw out 4 apples at the same time, which is called Big Four Happiness; 4. Throw to the red GOODLUCK (only two results will be opened, BAR and 1/2BAR); 5, Chinese display, is eaten that is, LOST.

All-in means to bet 8 coins each time, and the probability of losing all (directly to lost or to any other but losing when betting on the size) is 1/24 + 23/24×1/2 (the probability of losing the bet) = 52.9%; In the case of not betting on the size, the probability of winning is the same, but the loss of the losing side will be greatly reduced.

The probability of losing 6 coins in 1/2 of 1/2 apples is 1/24

The probability that Apple will lose 3 coins is: 4/24

The probability of losing 3 coins in 1/2 of the oranges, pears, and bells is: 3/24

The probability of making a profit of 2 coins for pears, oranges, and bells: 6/24

The probability of making a profit of 12 coins in Watermelon, Double Star, and 77 is 3/24

The probability of winning 1/2 watermelon, double star, and 77 to profit 2 coins is 3/24

The probability of making a profit of 42 coins in BAR is 1/24

The probability of winning 1/2 BAR to profit 13 coins is 1/24

As for the probability of winning two GOODLUCK, it is 2/24, but the profit is divided into small three yuan, **, big four happiness and big prize BAR cannot be calculated in detail for the time being.

Therefore, the probability of losing in theory is only: 1/24+4/24+3/24=8/24, and the probability of losing is only 9/24 (slightly greater than the theoretical value) if you count GOODLUCK, and the probability of winning is 15/24. But don't simply think that if you have a big winning surface, you will always go all-in to win, then it is a big mistake, just like **, winning does not win the handicap from time to time, and this simple lucky fruit machine in front of you, if you have been going all-in This simple and rude way to win, in fact, you must meet 2 conditions at the same time:

1. You have a certain amount of gambling money to make continuous bets; 2. It is necessary to test the machine for a period of time to make sure that the machine is not eating segments.

After calculating, Ye Liangchen put the paper and pen back into his schoolbag. At this time, there are still about half of the remaining game coins in the box, about 40 more. Kong Baocai is playing, and this is his turn for the third time. After playing a few more handfuls, Kong Bao went down, and still won 3 this time, Kong Bao showed off to the fat man with a little pride, because the fat man was so obsessed, three rounds of 30 only bet on watermelon, although he won once in the second round, the three rounds as a whole still lost 10 coins, and Bao Cai won more than 20 coins in three rounds. Although Jiang Hai was also playing for the first time, he also won 6 coins.

Ye Liangchen took out 2 pieces of 10 yuan in his pocket and walked to the bar.

When he came back with 3 small boxes of 240 coins (1 yuan and 10 coins, buy 10 yuan at one time and get an extra 20 coins), he saw the fat man and Kong Baocai looking at him blankly, and their mouths were so open that they could swallow the small box containing the game currency.

The friends were stunned!