Or search by topic
Published 2007 Revised 2009
1 | 3 | 5 |
4 | 6 | 2 |
1 | 3 | 5 | 7 | 9 | 11 | 13 | 15 |
12 | 14 | 10 | 2 | 4 | 16 | 8 | 6 |
The image in this problem is part of a piece of equipment found in the playground of a school. How would you describe it to someone over the phone?
This article explains how credit card numbers are defined and the check digit serves to verify their accuracy.
An introduction to coding and decoding messages and the maths behind how to secretly share information.