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Christmas tree;Brainteasers

Rudolph puts4 stars on a tree.

He colours each star either red or yellow.

* How many different ways can Rudolph colour his four stars?

BRAINTEASER SOLUTIONS, FROM P41

Solution: Sleigh ride

With 3 rows of 4 igloos, the shortest

route is 190 metres. For example:

With 4 rows of 5 igloos, the shortest

route is 350 metres. For example:

GRAPHIC EXAMPLES ARE NOT AVAILABLE ON DATABASE

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