Prob(two sets of matched birthdays) = 1 - [Prob(No matched birthdays)] + [Prob(One set of matched birthdays)] = 0.63
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.
Because back then, the Koreans used a different calendar, which went by the moon instead of the one that goes by the sun.
One! Why do people write such silly questions?
For the chance to be at least 50% that two people share the same birthday, there needs to be 22 people. For the chance to be exactly 100% that two people share the same birthday, there needs to be 366 people. If there was 365 people, there would be a very small chance that each person in the room would have different birthdays. With 366 people, there are not enough individual days for every person to have a different birthday, so there has to be at least one pair.
Prob(two sets of matched birthdays) = 1 - [Prob(No matched birthdays)] + [Prob(One set of matched birthdays)] = 0.63
Hammurabi had two birthdays because he believed in reincarnation!
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.
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.
Only those people with birthdays.
William Shakespeare.
they dont
Let us assume that there are exactly 365 days in a year and that birthdays are uniformly randomly distributed across those days. First, what is the probability that 2 randomly selected people have different birthdays? The second person's birthday can be any day except the first person's, so the probability is 364/365. What is the probability that 3 people will all have different birthdays? We already know that there is a 364/365 chance that the first two will have different birthdays. The third person must have a birthday that is different from the first two: the probability of this happening is 363/365. We need to multiply the probabilities since the events are independent; the answer for 3 people is thus 364/365 × 363/365. You should now be able to solve it for 4 people.
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!!!!