Blog

World Cup squads and the Birthday Paradox

World Cup squads and the Birthday Paradox
By Mark Mason on 16-05-18 10:28. Comments (0)
England's squad for the 2018 World Cup is being announced today. 23 players will make the trip to Russia - and coincidentally 23 is also the number at which the chance of two people sharing a birthday reaches 50 per cent. In fact it's a shade over: 50.73 per cent. Yes, you read that right - with just 23 people gathered together, it's more likely than not that two of them will have the same birthday.

The incredible ‘Birthday Problem'

The incredible ‘Birthday Problem'
By Mark Mason on 12-10-12 14:01. Comments (0)
How many people do you have to gather together in a room before it becomes more likely than not that at least two of them will share a birthday? This teaser is something I mention on the Central Line walk (which passes the wonderful Gresham College, where I first learned about it.) For years I've struggled to convince people that the answer - just 23 - is correct. But recently I found a way of doing it that really brings the truth of the puzzle home ...

Showing 1 - 2 of 2 Articles

< Previous 1 Next >
 

Other pages in this section...

Books


Read more...


Walks

Inspired by my book Walk the Lines: the London Underground - Overground, each of these trivia-packed walks uncovers London’s history by following a section of a Tube line ... at street level.
Read more...


Quizzes

Tailor made quizzes
Read more...


Podcasts

Aural delights from the world of trivia
Read more...


Content

Greyhound

A greyhound can accelerate from 0 to 45 mph in 1 second. This makes it the second-fastest accelerating animal on the planet, after the cheetah. A really striking way of learning about bio-mechanics - the greyhound can accelerate that quickly because it's so light, yet has such powerful legs. When the BBC's Top Gear raced one against a Mazda MX5 the greyhound accelerated more quickly - the Mazda has so much more weight to shift.