From the Straits Times
18 April 2015
HOW many ways are there to place four marbles of different colours into four empty boxes?
More Singapore students are cracking their brains over mathematics questions like this and the one dubbed “Cheryl’s Birthday” which left adults from Britain to Canada scratching their heads.
More than 9,000 students took part in the Singapore Mathematical Olympiad last year, up from around 7,000 a decade ago.
The contest is run by the Singapore Mathematical Society (SMS) for secondary and junior college students, and the top six represent Singapore at the International Mathematical Olympiad (IMO).
– See more at: http://www.straitstimes.com/news/singapore/education/story/olympiad-puzzles-hit-students-20150418#sthash.Wt8fkiIw.dpuf