S-File

Name: S file Creation time: 2017.6.23 Main content: The world has a population of more than 6 billion. If a person is lucky enough to live to be 80 years old, then a person has 29,200 days in his life, and meets about 1,000 people every day on average. A total of 29.2 Million people can be foreseen in a person's life, so the probability of meeting each person is 0.487%. We can probably meet about 3,000 people. Now, I am creating this file. The number of people recording the file is unknown, and the end date is uncertain, but I guarantee that it will be strictly recorded and true and reliable.