6 July 2025

• 06:4506:45, 6 July 2025 diff hist 0 2016 IMO Problems/Problem 2 →Solution current

26 December 2024

• 19:5419:54, 26 December 2024 diff hist +164 2013 Indonesia MO Problems/Problem 6 →Solution current
• 19:4919:49, 26 December 2024 diff hist 0 2013 Indonesia MO Problems/Problem 6 →Solution
• 19:4819:48, 26 December 2024 diff hist −1,287 2013 Indonesia MO Problems/Problem 6 No edit summary
• 19:4119:41, 26 December 2024 diff hist +2,258 N 2013 Indonesia MO Problems/Problem 6 Created page with "==Problem== Suppose <math>p > 3</math> is a prime number and <cmath>S = \sum_{2 \le i < j < k \le p-1} ijk</cmath> Prove that <math>S+1</math> is divisible by <math>p</math>...."

25 December 2024

• 06:0606:06, 25 December 2024 diff hist +1 2013 Indonesia MO Problems/Problem 4 →Solution current
• 06:0606:06, 25 December 2024 diff hist +666 m 2013 Indonesia MO Problems/Problem 4 No edit summary
• 03:5903:59, 25 December 2024 diff hist +1,591 N 2013 Indonesia MO Problems/Problem 4 Created page with "==Problem== In a <math>4 \times 6</math> grid, all edges and diagonals are drawn (see attachment). Determine the number of parallelograms in the grid that uses only the line..."

24 December 2024

• 23:0723:07, 24 December 2024 diff hist −1,426 2013 Indonesia MO Problems/Problem 1 →Solution current
• 23:0123:01, 24 December 2024 diff hist 0 2013 Indonesia MO Problems/Problem 1 →See Also
• 23:0023:00, 24 December 2024 diff hist −68 2013 Indonesia MO Problems/Problem 1 →Problem 1
• 22:5922:59, 24 December 2024 diff hist +625 2013 Indonesia MO Problems/Problem 1 →Problem
• 22:5822:58, 24 December 2024 diff hist +2,460 N 2013 Indonesia MO Problems/Problem 1 Created page with "==Problem== Show that for any positive integers <math>a</math> and <math>b</math>, the number <cmath>n=\mathrm{LCM}(a,b)+\mathrm{GCD}(a,b)-a-b</cmath> is an even non-negative..."
• 21:1421:14, 24 December 2024 diff hist +455 2012 Indonesia MO Problems/Problem 5 No edit summary current
• 20:4920:49, 24 December 2024 diff hist +341 2012 Indonesia MO Problems/Problem 5 No edit summary
• 03:4703:47, 24 December 2024 diff hist +1,037 2012 Indonesia MO Problems/Problem 5 No edit summary
• 03:4003:40, 24 December 2024 diff hist +401 N 2012 Indonesia MO Problems/Problem 5 Created page with "==Problem== Let <math>n</math> be a positive integer. Show that the equation<cmath>\sqrt{x}+\sqrt{y}=\sqrt{n}</cmath>have solution of pairs of positive integers <math>(x,y)</m..."

20 December 2024

• 19:1919:19, 20 December 2024 diff hist +12 2012 Indonesia MO Problems/Problem 7 No edit summary current
• 19:1619:16, 20 December 2024 diff hist +2,053 2012 Indonesia MO Problems/Problem 7 No edit summary
• 07:3507:35, 20 December 2024 diff hist −13 2012 Indonesia MO Problems/Problem 2 No edit summary current
• 07:2607:26, 20 December 2024 diff hist −10 2012 Indonesia MO Problems/Problem 2 No edit summary
• 07:2607:26, 20 December 2024 diff hist +68 2012 Indonesia MO Problems/Problem 2 No edit summary
• 07:2507:25, 20 December 2024 diff hist +322 2012 Indonesia MO Problems/Problem 2 No edit summary
• 06:5906:59, 20 December 2024 diff hist +286 N 2012 Indonesia MO Problems/Problem 7 Created page with "Problem 7 Let <math>n</math> be a positive integer. Show that the equation<cmath>\sqrt{x}+\sqrt{y}=\sqrt{n}</cmath>have solution of pairs of positive integers <math>(x,y)</mat..."
• 02:5002:50, 20 December 2024 diff hist +2 2012 Indonesia MO Problems/Problem 2 No edit summary
• 02:4602:46, 20 December 2024 diff hist +711 N 2012 Indonesia MO Problems/Problem 2 Created page with "By AM-GM, <cmath>(1+a_k)^k=(\frac{1}{k-1}+\frac{1}{k-1}+\dots+\frac{1}{k-1}+n_k)^k\geq (k\sqrt[k]{\frac{a_k}{(k-1)^{k-1}})^k=\frac{k^k\cdot a_k}{(k-1)^{k-1}}</cmath> Substitu..."