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What is the probability of a set of 28 people having two sets of matched birthdays?
Prob(two sets of matched birthdays) = 1 - [Prob(No matched birthdays)] + [Prob(One set of matched birthdays)] = 0.63
Why do people have birthdays?
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.
Why Korean people have two birthdays?
Because back then, the Koreans used a different calendar, which went by the moon instead of the one that goes by the sun.
How many birthdays in a year?
One! Why do people write such silly questions?
How many people are needed in a room before two of them share the same birthday?
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.
