It is to celebrate the day of your birth. and the reason why peoples 18th birthday is so important is because they are growing into an adult.
Prob(two sets of matched birthdays) = 1 - [Prob(No matched birthdays)] + [Prob(One set of matched birthdays)] = 0.63
One! Why do people write such silly questions?
No. You're only born 1 day, and can only have 1 birthday. Of course you can celebrate it on another day, and then call it 2 birthdays, but you can only have one real :)
Because there is billions of people, and only 365 days for their birthdays to be spread over.
about 1,000
Millions around the world.
obviosly, they celebrate birthdays but they do it with a lot of alchocol!
They don't. They only celebrate 15th birthdays, which is a quinceanera.
Only those people with birthdays.
Prob(two sets of matched birthdays) = 1 - [Prob(No matched birthdays)] + [Prob(One set of matched birthdays)] = 0.63
William Shakespeare.
they dont
The average European people have up to 70-80 birthdays!!!!
Most people who had birthdays on February 9,2003 probably celebrated them in some way.
$500,000,000
Cake?
12.5%