Famous brain teaser

[Justin Passing]

But if you want a really unintuitive odds problem, try this.

Imagine you were going to offer a simple bet, i.e. no odds-based payout - you bet someone £10, if you win he gives you £10, if you lose you give him £10.

You and a mate are about to walk into a pub. How many people would you like it to contain for you to be happy saying "I bet you £10 that there are at least 2 people in there who have the same birthday (day & month)"?

Dunno mate, but my intuition, or something, is telling me it would be a couple of dozen.
Yes I could sit and work it out but I CBA!

 

[MNW67]

But if you want a really unintuitive odds problem, try this.

Imagine you were going to offer a simple bet, i.e. no odds-based payout - you bet someone £10, if you win he gives you £10, if you lose you give him £10.

You and a mate are about to walk into a pub. How many people would you like it to contain for you to be happy saying "I bet you £10 that there are at least 2 people in there who have the same birthday (day & month)"?

I'd probably want an 85% chance of winning.

 

[pete01]

sneaky pete

Who?