Each path is 10 metres long.
When Santa visits, he likes to go along each path at least once .
His route can start and end at any igloo.
* How long is the shortest route Santa can take?
* What if there are 4 rows of 5 igloos?
BRAINTEASER SOLUTIONS, FROM P41
Solution: Christmas Tree
There are 16 different ways:
1 way for 4 red;
1 way for 4 yellow;
4 ways for 3 red and 1 yellow;
4 ways for 1 red and 3 yellow;
6 ways for 2 red and 2 yellow (shown below).
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