Copyright © University of Cambridge. All rights reserved.
'Three Ball Line Up' printed from http://nrich.maths.org/
Two children are playing with three balls, one blue, one red and one green.
They toss up the balls, which run down a slope so that they land in a row of three.
How many different ways could the balls land?
You might like to use the interactivity below to explore the problem.
Full Screen Version
This text is usually replaced by the Flash movie.