12 February 2014

• 00:0500:05, 12 February 2014 diff hist +7 2014 AMC 12A Problems/Problem 15 →Solution Two

12 June 2011

• 01:4001:40, 12 June 2011 diff hist 0 1972 USAMO Problems/Problem 2 →Solution 2
• 01:4001:40, 12 June 2011 diff hist −650 1972 USAMO Problems/Problem 2 →Solution 1

13 April 2011

• 21:4021:40, 13 April 2011 diff hist −547 1994 USAMO Problems/Problem 4 →Solution
• 21:3921:39, 13 April 2011 diff hist −670 1994 USAMO Problems No edit summary

11 April 2011

• 23:4123:41, 11 April 2011 diff hist −29 1994 USAMO Problems/Problem 4 No edit summary
• 23:4023:40, 11 April 2011 diff hist +559 N 1994 USAMO Problems/Problem 4 Created page with 'Since each <math>a_{i}</math> is positive, by Muirhead's inequality, <math>2(\sum a_{i}^2) \ge (\sum a)^2 \ge n</math>. Now we claim that <math> \frac{n}{2}> (\frac{1}{4})*(1+..…'

5 April 2010

• 21:1421:14, 5 April 2010 diff hist +203 N 2010 AMC 10B Problems/Problem 25 Created page with 'P(x)-a=(x-1)(x-3)(x-5)(x-7)Q(x). Then, plugging in values of 2,4,6,8, we get -2a=-15Q(2)=9Q(4)=-15Q(6)=105Q(8). Thus, the least value of a must be the lcm(15,9,15,105). Solving,…'

29 March 2010

• 23:4023:40, 29 March 2010 diff hist +6,251 N 2010 AMC 10B Created page with 'Note: Excuse me for my notation, I hope someone can put these into correct format. 1. What is 100(100-3)-(100*100-3)? (A)-20,000 (B)-10,000 (C) -297 (D)-6 (E)0 2.Makayla attende…'

19 March 2010

• 17:5617:56, 19 March 2010 diff hist +596 2001 IMO Shortlist Problems/N6 No edit summary

6 March 2010

• 16:2016:20, 6 March 2010 diff hist −12 1972 USAMO Problems/Problem 2 No edit summary
• 16:2016:20, 6 March 2010 diff hist +631 1972 USAMO Problems/Problem 2 No edit summary