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Men's Weekly

How many people need to be in a room for two to share a birthday? It's less than you think. Here's why

  • Written by Benjamin Zunica, Lecturer in Secondary Maths Education, University of Sydney
How many people need to be in a room for two to share a birthday? It's less than you think. Here's whyA veridical paradox with practical uses. Cottonbro Studio/PexelsCC BY-SA

Have you ever bumped into someone with the same birthday as you? What about someone sharing a birthday in your workplace? How common is a shared birthday, anyway?

The birthday problem, as it’s called by mathematicians, reveals problems with our understanding of number...

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