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Card Trick 2

Can you explain how this card trick works?

Painting Cubes

Imagine you have six different colours of paint. You paint a cube using a different colour for each of the six faces. How many different cubes can be painted using the same set of six colours?

Lesser Digits

How many positive integers less than or equal to 4000 can be written down without using the digits 7, 8 or 9?

Cube Paths

Age 11 to 14 Challenge Level:

The diagram shows a skeletal view of a 2 by 2 by 2 cube with one route 'down' the cube.

How many routes are there on the surface of the cube from A to B?
(No `backtracking' allowed, i.e. each move must be away from A towards B.)

Cube Paths diagram
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.
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NRICH is part of the family of activities in the Millennium Mathematics Project.