Olympic Magic

Stage: 4 Challenge Level: Challenge Level:1

The Olympic emblem consists of five overlapping rings containing nine regions. In order to contribute to a pension fund for the retiring International Olympic Committee people are asked to deposit money into each region.

The guidelines allow the delegate to take all the money in any one of the rings. Place the numbers 1, 2, ... 9 in the nine regions so that the amount in each ring is the same. How many different ways can you find to do this? (Problem from University of Sydney Mathematics Enrichment Groups 1999)
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Published March 2003,August 2008.