I want some cubes painted with three blue faces and three red faces. How many different cubes can be painted like that?
Find the Fake
Stage: 4 Challenge Level:
There are 12 identical looking coins, one of which is a fake.
The counterfeit coin is of a different weight to the rest. Using
only a simple balance, what is the minimum number of weighings
needed to locate the fake coin and how is this done?
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the
NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to
embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities
can be found here.