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To absolutely guarantee that at least two people were born on the same date you would need 367 people. However with 29 people the odds would be approaching unity but it does not guarantee this will be the case.
367
You could never guarantee 1000 handshakes because the people may choose not to shake hands! If each person did shake hands with everyone else, then 46 people would suffice.
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.
Every sixth number will be a multiple of 6, so you need at least six consecutive numbers to guarantee that one of them will be divisible by 6.
To absolutely guarantee that at least two people were born on the same date you would need 367 people. However with 29 people the odds would be approaching unity but it does not guarantee this will be the case.
At least 100 all over the world.
A person shares their birthday with at least nine million different people around the world.
367
You could never guarantee 1000 handshakes because the people may choose not to shake hands! If each person did shake hands with everyone else, then 46 people would suffice.
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.
70,000 people die on their birthday
How many people have the birthday of March 23 in the world?
3 people that I know have th same birthday as me.
alot of people have there birthday on November 22
367 people (not forgetting leap year) unless the participants are chosen based on their birthday.
How many people do you need to have in a room for the odds to be in favour that at least 2 of them will share a birthday?(The answer is 23)Seems easy, but requires a lot.