List any 3 numbers. It is always possible to find a subset of
adjacent numbers that add up to a multiple of 3. Can you explain
why and prove it?
How to build your own magic squares.
Weekly Problem 2 - 2013
After performing some operations, what number is your answer always a multiple of?
Yanqing from Devonport High School for
Girls sent us a complete solution to this problem:
Well done Yanqing.