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?
People cannot have two birthdays. A birthday is the specific day that a person was born and it occurs only once a year.
Because there is billions of people, and only 365 days for their birthdays to be spread over.
Because back then, the Koreans used a different calendar, which went by the moon instead of the one that goes by the sun.
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.
Prob(two sets of matched birthdays) = 1 - [Prob(No matched birthdays)] + [Prob(One set of matched birthdays)] = 0.63
Only those people with birthdays.
William Shakespeare.
they dont
Most people who had birthdays on February 9,2003 probably celebrated them in some way.
The average European people have up to 70-80 birthdays!!!!
$500,000,000
Cake?
12.5%