in a group of 23 people, you will have a 50% chance of sharing a birthday with them. Though this requires a lot more people if including your birth year also. Not sure why the baby’s date would be more significant than some other random people from elsewhere. Would be interesting if sociologists could predict the eventual standing of kids born in different countries, on the same date though – would it be any closer than astrological predictions?

Share the same birthday? It’s no coincidence, it’s maths

Link: https://www.dailymail.co.uk/scie

Joseph Mazur is Professor Emeritus of Mathematics at Marlboro College in Vermont has published a new book aims to demystify everyday coincidences through simple probability.