A reporter makes a bet with a passer-by about how many people they'd have to ask before they found two with a matching birthday. It turns out that you only need to ask 35 people for it to be very likely that you'll get a match, and the clip explains why.

This clip is from:
The One Show
First broadcast:
22 August 2007

Could be used as an enrichment activity on probability. Students could test the probability for themselves by conducting the birthday survey round the class or school. It could be used as an introduction to more advanced level work on permutations and combinations.