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  2. Birthday problem - Wikipedia

    en.wikipedia.org/wiki/Birthday_problem

    The event that all 23 people have different birthdays is the same as the event that person 2 does not have the same birthday as person 1, and that person 3 does not have the same birthday as either person 1 or person 2, and so on, and finally that person 23 does not have the same birthday as any of persons 1 through 22. Let these events be ...

  3. Wikipedia:Reference desk/Science/Birthday probability ...

    en.wikipedia.org/.../Birthday_probability_question

    The probability that 365 people have distinct birthdays is 365!/365^365. (1/365! is the probability that you take 365 people with distinct birthdays and, picking them one at a time, correctly pick them in birthday order).

  4. List of paradoxes - Wikipedia

    en.wikipedia.org/wiki/List_of_paradoxes

    Birthday paradox: In a random group of only 23 people, there is a better than 50/50 chance two of them have the same birthday. Borel's paradox : Conditional probability density functions are not invariant under coordinate transformations.

  5. Four sisters share the same birthday ... but they're not ...

    www.aol.com/news/four-sisters-share-same...

    Kristin and Nick assumed the baby would have to be born within 24 hours, making her birthday Aug. 24. But Valentina had other ideas. She made her arrival at 8:11am on Aug. 25, at just 5 pounds, 12 ...

  6. Why moms and their children often share a birthday ... - AOL

    www.aol.com/news/why-moms-children-often-share...

    Another family in Alabama (mom, dad and baby) share the same Dec. 18th birthday. Huntsville Hospital for Women & Children in Huntsville, where the baby was born, called the occurrence "a chance ...

  7. Family's 4 children all have the same birthday - AOL

    www.aol.com/news/2014-01-17-family-s-4-children...

    News & Star says the chances of having four birthdays on the same day is 133,225 to 1. But beating those odds also means the family is going to have to celebrate a 21st, an 18th and a 16th ...

  8. Birthday effect - Wikipedia

    en.wikipedia.org/wiki/Birthday_effect

    A study using the populations of Denmark and Austria (a total of 2,052,680 deaths over the time period) found that although people's life span tended to correlate with their month of birth, there was no consistent birthday effect, and people born in autumn or winter were more likely to die in the months further from their birthday. [8]

  9. Mom, dad and newborn daughter all share the same birthday - AOL

    www.aol.com/news/mom-dad-newborn-daughter-share...

    “This is an exciting time for any family, but it’s extra special for this family because they all share the same birthday,” the post reads. “That’s right! On Sunday, Dec. 18, a chance ...