Can you solve it? The pals that broke the internet, ten years on
by Alex Bellos from on (#6W9N5)
Albert, Bernard and Cheryl return
Ten years ago I published a maths olympiad question from Singapore on the Guardian website, and it changed my life.
Cheryl's birthday problem' went viral. Its unexpected success led to the birth of this column in May 2015. And here we are, almost 250 puzzles later.
May 15, May 16, May 19
June 17, June 18
July 14, July 16
August 14, August 15, August 17
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