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The equation expresses the fact that the first person has no one to share a birthday, the second person cannot have the same birthday as the first ( 364 / 365 ), the third cannot have the same birthday as either of the first two ( 363 / 365 ), and in general the n th birthday cannot be the same as any of the n − 1 preceding birthdays.
The probability that 365 people have distinct birthdays is 365!/365^365. (1/365! is the probability that you take 365 people with distinct birthdays and, picking them one at a time, correctly pick them in birthday order).
In some Asian countries that follow the zodiac calendar, there is a tradition of celebrating the 60th birthday. In Korea, many celebrate a traditional ceremony of Baek-il (Feast for the 100th day) and Doljanchi (child's first birthday). In Japan, people celebrate a Coming of Age Day for all those who have turned 18.
Another family in Alabama (mom, dad and baby) share the same Dec. 18th birthday. Huntsville Hospital for Women & Children in Huntsville, where the baby was born, called the occurrence "a chance ...
All four of Kristin Lammert's daughters were born on August 25 — but they're not multiples. The girls were born in 2015, 2018, 2021 and 2024.
All four of the Lammert daughters were born on Aug. 25: Sophia, 9, Giuliana, 6, Mia, 3, and Valentina, 2.5 weeks. None were scheduled births.
A study using the populations of Denmark and Austria (a total of 2,052,680 deaths over the time period) found that although people's life span tended to correlate with their month of birth, there was no consistent birthday effect, and people born in autumn or winter were more likely to die in the months further from their birthday. [8]
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