# How Many People Have The Same Birthday?

## How do leap year babies age legally?

If you were born on Leap Day 1920, you would be 100 years old, or 25 in Leap Day years.

The year must be evenly divisible by 4.

If the year can be evenly divided by 100, it is not a leap year unless the year is also evenly divisible by 400, according to mathisfun.com..

## What are the odds of having the same birthday?

The birthday paradox, also known as the birthday problem, states that in a random group of 23 people, there is about a 50 percent chance that two people have the same birthday.

## What is the most common birthday in the world?

September ninthSeptember 9 is the most common birth date on the planet, which has seen an average of 12,301 births from 1994 to 2004 in the United States alone. All the people born on September ninth are usually conceived on December 17 of the previous year.

## Does 365 billion have 7 birthdays?

365 or 7 billion? 366. Birthday can refer to days to be born on (so technically 366) or days to celebrate birth. …

## Which month babies are intelligent?

Those born in September are, apparently, the smartest out of the entire year. According to Marie Claire, a study published in the National Bureau of Economic Research found that there’s a clear correlation between the month during which you were born and how smart you are.

## What is the least common birthday in the world?

The Least Common Birthdays Christmas Day is the least common), while New Year’s Day is the second to least common. Thanksgiving and the Fourth of July also rank low on the list. And perhaps because summer conceptions aren’t as common as winter ones, April 20 is the 328th most common.

## Is there a day no one was born?

December 6th is a special day at Who2: it’s the only day of the year on which nobody in our database was born. That’s 2843 famous people (and counting) and none of them born on December 6th. The 6th has been the lone holdout for a couple of years now.

## What happens if your birthday is Feb 29?

29. Those born on that day don’t always get to celebrate their actual birthday — since that date occurs only every four years. Someone born on Leap Day typically celebrates birthdays on Feb. … If you were born on Leap Day 1920, you would be 100 years old, or 25 in Leap Day years.

## What is the luckiest birth month?

MaySome studies say that the babies with the lowest birth weight are born in May — chalk it up to the lower amounts of vitamin D in the womb during a winter pregnancy. A study done in the U.K. showed that May is the luckiest month to be born, and October is the unluckiest.

## Can a person have 2 birthdays?

You can celebrate your actual day of birth, and if there are other occasions to remember, then they can be “birthdays” too. … These other birthdays will not make you older- only your physical birthday can do that- but it’s nice to remember and celebrate other events that mean something to you.

## What’s the rarest birthday?

A new chart posted to Reddit reveals the most and least common birthdays in the U.S. It’s based on Social Security data on birthdays from 2000 to 2014. According to the chart, Christmas Day is the least common birthday, followed by New Years Day, and Christmas Eve and the 4th of July.

## Is there a day when nobody died?

Yes, actually more than one day with no deaths. No deaths occurred on September 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, or 13 in the year 1752. … Mind you if you were still using the Julian calendar or, say, the Chinese calendar, or did not live in England or Wales then of course people died.

## What is the best birthday?

Another study, which looked at average number of presents received by people born on a certain day and likelihood of friends attending a party that day, found July 28 to be the best birthday day.

## What month are most serial killers born?

Here’s a more succinct summary of the data from UberFacts: “Seventeen serial killers were born in November, compared with an average of nine for other months, out of a total of more than 100 in the study. Those born in November are most likely to believe they get a raw deal.