Index of past problems

Problem 39 (11th May 2009)

Problem 38 (28th April 2009)

Problem 37 (16th March 2009)

Problem 36 (9th March 2009)

Problem 35 (2nd March 2009)

Problem 34 (23rd February 2009)

Problem 33 (26th January 2009)

Problem 32 (24th November 2008)

Problem 31 (10th November 2008)

Problem 30 (13th October 2008)

Problem 29 (6th October 2008)

Problem 28 (29th September 2008)

Problem 27 (22nd September 2008)

Problem 26 (15th September 2008)

Problem 25 (8th September 2008)

Problem 24 (23rd June 2008)

Problem 23 (16th June 2008)

Problem 22 (9th June 2008)

Problem 21 (2nd June 2008)

Problem 20 (19th May 2008)

Problem 19 (5th May 2008)

Problem 18 (28th April 2008)

Problem 17 (14th April 2008)

Problem 16 (17th March 2008)

Problem 15 (10th March 2008)

Problem 14 (3rd March 2008)

Problem 13 (25th February 2008)

Problem 12 (8th February 2008)

Problem 11 (1st February 2008)

Problem 10 (25th January 2008)

Problem 9 (18th January 2008)

Problem 8 (11th January 2008)

Problem 7 (17th December 2007)

Problem 6 (10th December 2007)

Problem 5 (3rd December 2007)

Problem 4 (26th November 2007)

Problem 3 (19th November 2007)

Problem 2 (12th November 2007)

Problem 1 (5th November 2007)