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What are the odds of siblings being born on the same day?
However, the odds that siblings share the same birth date, as well as time, aren’t as improbable as it may seem. Mathematicians quibble over the precise odds, but UC Berkeley’s Michael Hutchings calculates the probability at a little less than one in 500,000 for a family with two children who aren’t twins.
How rare is it for your child to be born on your birthday?
He said the chance of two people being born on the same day and having a baby on their birthday is about 1/365 times 1/365. “That comes out to . 0000000751 — seven zeros and then 751,” or about 7.5 in a million, he said, which comes to about one in 133,000.
What is the probability of having the same birthday as siblings?
Look at the parents, and then place your bets. The simplest model assumes that there are 365 days in a year, each sibling having the same probability of 1/365 of being born on any of those days, and their births are independent. That implies the probability that they have the same birthday is 1/365.
Do birthdays count towards the number of days in between?
We then count every day in between, but we don’t count the day of the younger person’s birthday. Basically, if you enter birthdays within one day of each other, it will read as 1 day. If you enter the same birthdays it’ll come back as 0 days.
How do you calculate the age difference between two birthdays?
Using the Age Difference Calculator. To compute the distance in age between two birthdays, simply fill out the two input fields: Birthday One: Enter the birthday of the first person Birthday Two: Enter the second person’s birthday Once you’re happy with the dates, hit the ‘Calculate Age Difference’ button.
How do birthdays work with the same day?
Basically, if you enter birthdays within one day of each other, it will read as 1 day. If you enter the same birthdays it’ll come back as 0 days. How do leap years affect birthday calculations?