Copyright © University of Cambridge. All rights reserved.

'Two's Company' printed from http://nrich.maths.org/

Show menu


A container holds $4$ yellow marbles, $2$ blue marbles and $1$ red marble.
The marbles are identical in all ways except colour.
Shake the container, and look at how the marbles settle.

You win if two blue marbles touch.

Did you win?
Complete several shakes and look at your results.

Full Screen Version
If you can see this message Flash may not be working in your browser
Please see http://nrich.maths.org/techhelp/#flash to enable it.



Approximately how often do you think you would win if you completed $100$ throws?
Make a prediction and then check it by doing the experiment.

Can you explain how to work out the theoretical probability of winning?

You may find these sheets useful if you want to work on paper or submit a solution.