Sleigh ride;Brainteasers

In Snow Town, 3 rows of 4 igloos are linked by 17 sleigh paths.

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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