What is the probability of being born in different years, but on the same day and month?

The odds are high! An average of 200,000 people are born every day worldwide. 6,000,000,000 = 30,000, that is, for every 30,000 people, two people are born in one day (this is the calculation method of being born on the same day in the same year, the same month, and the probability is greater if it is only born on the same day.)

At present, the oldest person is 100 years old, and the youngest is 1 year old, 30,000 100 = 300, and at least two out of 300 people are born in one day. The probability is 1 300

In other words, an average of 20 million people living on Earth are born in the same place. Because a year is more than 300 years, 6 billion people are always born in these 300 days, no matter what year it is. ）。This is only a theoretical value and does not exclude an average of 10,000 deaths per day.

24 hours a day, a total of 86,400 seconds. An average of individuals are born every second).

Let's say my birthday is January 30th.

You have to start with me with the odds of 1 12

On the same day 1 31

1 31 times 1 12

for probability.

1 365 is inaccurate.

Because a leap year is 366 days, what if the birthday is February 29.

The probability of a leap year is 97 400

It should be (1 365) (303 400) + (1 366) (97 400).

For 367 days, there must be two people on the same day and month.

Assuming there are n people, then the probability of being born on the same day in the same month is (1+2+......n）/366

1. It is not a leap year, these two people, the probability of fixing one person's birthday as a certain day, and the other person's birthday is also on this day is 1 365, in fact, it can be understood that the other person's birthday is also this day, that is, he has to choose one day from the 365 days of the year, which is the same as the birthday of the first person. The probability is 1 365.

2. If it is a leap year, the probability that two people have the same birthday is 1 366.

3. In any year, the probability of having the same birthday is (3 4) * (1 365) + (1 4) * (1 366).

4. In addition, if one person's birthday is February 29 and the other person has the same birthday as him, the probability is (3 4) * (0 366) + (1 4) * (1 366) = 1 1464.

It can be understood that the probability of 1 leap year in 4 years and February 29 in 3 non-leap years is 0 366, which is 0, and only leap years (accounting for 1 4) will have February 29, which may be the same as the birthday of the first person.

Fate is a very wonderful thing, in life, I think it is difficult to meet a person with the same year, the same month and the same day, but sometimes I will let myself meet, everyone is more curious about this, I want to know the probability of 2 people born on the same day, the same month, and the same day, what is the probability of meeting the same birthday?

Now from the software and professional calculations, the probability of two people born in the same year, the same month, and the same day is around, from which we can see that the probability is still relatively low, if you can really meet people who are born at the same time, then it is a great fate, and it is also an encounter worth cherishing.

The probability of having a birthday on the same day needs to be measured according to the year, if it is a leap year, then the probability of a birthday on the same day is 1 366; If it is not a leap year, then the probability of encountering the same birthday on the same day is (3 4) * (1 365) + (1 4) * (1 366); On February 29, the probability of two people on the same day is (3 4) * (0 366) + (1 4) * (1 366) = 1 1464. It is a probability that there is a certain change, which needs to be analyzed in a comprehensive manner, and if you really don't know, you can also calculate it through software.

Generally speaking, it is relatively rare to meet people born on the same day and month in the same year, these people are more similar in life experience, personality and other aspects, if they meet, then they are still more compatible, and they may become good friends.

There are 365 days a year, and the probability of meeting someone born on the same day, the same month, and the same year in your daily life is very low, but it is not impossible. Many people wonder what happens if they meet someone born on the same day, month, and year in the same year. Is it good or bad?

The following will introduce what is the probability of meeting a person born on the same day, the same month, the same year?

The probability of being born on the same day, month and year is very low, about 3.1 million probability, which means that there will be one person born on the same day, the same month, and the same day as you in every 10,000 people. Is it good to marry someone born on the same day, the same month, and the same year? The traditional saying is that in the eight characters of men and women born on the same day and month in the same year, the two pillars of the year and month are the same, but because the yin and yang of men and women are different, the luck is very different, and the probability of divorce is greater than that of other marriage partners.

In reality, although it is generally said that it is not good for people born on the same day and month to get married, there are also many people who can cite counterexamples in life, and there are many couples born on the same day, same month, and same day, and they are also living very well. In fact, whether the marriage is good or not has little to do with the customs, the main thing is that the two people have to be in love.

People born on the same day and month in the same year get married, traditionally speaking, the birth date is not very compatible, but in real life, you should also follow your own situation, do not be bound by tradition, miss love.

The probability of being born on the same day and month is 3 in 100,000.

According to the 2018 National Bureau of Statistics, the number of births in China in 2018 was 15.23 million, which means that 10,000 people were born in Hedong every day. It can be seen that according to the current birth rate, there are about 10,000 people born in China in the same year, month, and day as you.

China has a population of 1.4 billion, and if you put 10,000 people into 1.4 billion people, you can calculate that the probability that you will meet someone born on the same day, the same month, the same year is 3 in 100,000, that is to say, among the 10,000 people in Dayue, you will meet a person born on the same day, the same month, and the same year as you.

Introduction to Probability:

Probability, also known as probability, is a measure of the probability of a random event occurring. A random event is an event that may or may not occur under the same conditions. For example, from a batch of ** and defective goods, randomly draw a piece, and the ** drawn is a random event.

Suppose n experiments and observations are carried out on a random phenomenon, in which event A occurs m times, that is, the frequency of its occurrence is m and n. After a lot of trial and error, it is common for m n to get closer and closer to a certain constant (see Bernoulli's law of large numbers for details). This constant is the probability of event a occurring, which is often expressed by p(a).

In China, the probability of being born on the same day in the same month and year is 1300000000 365*68=52377 (person-days. ）

Suppose two people are born on different months and days.

i.e. (365 365) * (364 365) = 364 365

Then two people born in the same month, then, 1-364 365=1 365

As for the year, since it involves a leap year, you have to look at your year value range. Make a decision again.

It's a coincidence that I met a person born on the same day, the same month, and the same name, just different surnames.