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Four generations celebrate their birthday on the same day in an U.S. family, the probability less than 1/11.7 billion

Four generations celebrate their birthday on the same day in an U.S. family, the probability less than 1/11.7 billion

A funny family all favor January 4 in Ohio, the United States: just 1 year old baby girl Courtney and her 34-year-old mother, Julia, 65-year-old grandfather and his late father, Richard Marshall’s birthday are all actually the day. The mathematician estimated that the probability that four generations in a family born on the same date is very low, only about 1/117 billion!

Marshall was born on January 4, 1924; Richard was born on January 4, 1947; Julia was born on January 4, 1978. On January 4, 2011, Julia not earlier not later, miraculously gave birth to a daughter, Courtney!

Hearing of the true funny stories, maybe you will say, perhaps they arrange funny birthday in advance. It is worth mentioning that, although four generations’ birthday is January 4, but this is not the result of deliberately arrangement in advance, because all four was born through the natural childbirth.

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