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Everyone shares their birthday with someone or another.
During your birthday celebration.
Some people think having their birthday on Valentine's Day is adorable because it is a day for love. It is also special when a person can share their birthday with another popular holiday.
Both. There are many people with that name in Mexico having both sexes.
1 in 20,000! I know 4 people with my same birthday, 3 of them not being related...
EVERYBODY in the US has the same birthday as someone else in the US. The converse would be that someone in the US has his/her own birthday and nobody else in the entire population of 300,000,000 people in the US was born on that day.
happy birthday is a song for people who are celebrating some bodes day of birth by having cake and food and inviting friends
The probability with 30 people is 0.7063 approx.
The first thing to note is that names and birthdays are independent of each other. Someone born on 5th June isn't more likely to be called Chris, and someone called Katie isn't more likely to be born on 20th October, or whatever. Thus the probability is equal to the probability someone has your name, multiplied by the probability someone has your birthday. The latter is just 1/365.25, as you are equally likely to be born on each day. The former could be anything. If you have a really common name, that 1 in 1,000 people have, then the probability of someone having the same birthday and name as you will be 1/365,250 Multiply this probability by the world population (which we'll round to 7 billion) and you get: 7,000,000,000/365,250 = 19,165 so 19,165 people would have the same name and birthday as you!
That is just the birthday tradition. People give gifts because they are happy that person is born. It is a way of showing appreciation for someone.
Well, if you wanted to be blunt about it, post it as your status. For example: "I'm having an amazing birthday so far." Most people just put it in their info box, and facebook will share it to others on the day of your birthday.
Statistically speaking, you are going to find people who have the same birthday. For example, in a classroom of 30 students, you have a 40% chance to have the same birthday as someone else in the classroom.