Maths and Stats by Email | Shared birthdays, Push your luck

Maths and Stats by Email | Shared birthdays, Push your luck: "Article: How to never forget a birthday  
   

On 12 January this year, about 370 000 babies were born around the world, including a boy named Ryan. But Ryan’s birthday is a bit special – he shares it with all three of his siblings: older brother Sam, and twin sisters Brook and Nicole. This story seems almost impossible, but it is true. The family lives in England, and all four children have their birthday on 12 January. So how unlikely is it? Can we calculate the odds?
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