Live Problems - Stage 4 & 5

Each time you visit the NRICH site there will be some activities which are 'live'. That means we are inviting you to send us your solutions and we will publish a selection of them, along with your name and your school's name. If you'd like to know more about what we're looking for, read this short article.

These tasks will stop being live after Monday 7 December.

Last One Standinglive

Age 14 to 16 Challenge Level:

Imagine a room full of people who keep flipping coins until they get a tail. Will anyone get six heads in a row?

The Better Choicelive

Age 14 to 16 Challenge Level:

Here are two games you can play. Which offers the better chance of winning?