Live Problems - Stage 3, 4 & 5

Each time students visit the NRICH site there will be some activities which are 'live'. That means we are inviting students to send us their solutions and we will publish a selection of them, along with their name and 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 12 October.

What Does Random Look Like?live

Age 11 to 14 Challenge Level:

Engage in a little mathematical detective work to see if you can spot the fakes.

In the Baglive

Age 11 to 14 Challenge Level:

Can you guess the colours of the 10 marbles in the bag? Can you develop an effective strategy for reaching 1000 points in the least number of rounds?

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?

Secondary Toughnutslive

Age 11 to 18 Challenge Level:

These secondary problems have not yet been solved. Can you be the first?