# User contributions

- 14:47, 29 March 2021 (diff | hist) . . (+120) . . 2013 AMC 8 Problems/Problem 3 (more detailed solution) (current)
- 21:23, 11 March 2021 (diff | hist) . . (+41) . . 2021 AIME I Problems/Problem 14
- 21:22, 11 March 2021
(diff | hist) . .
**(+3,047)** . . 2021 AIME I Problems/Problem 14 (add a solution) - 19:46, 11 March 2021
(diff | hist) . .
**(+1,156)** . . 2021 AIME I Problems/Problem 3 (more rigorous solution) - 18:48, 11 March 2021 (diff | hist) . . (+78) . . User:Scrabbler94 (current)
- 18:46, 11 March 2021 (diff | hist) . . (-174) . . 2007 AIME I Problems/Problem 4 (Undo revision 109540 by Brudder (talk) Solution 2 (LCM/GCF) is wrong; this method would obtain 105 years even if the periods were 6000, 8400, 14000 for example.) (current) (Tag: Undo)
- 14:18, 22 February 2021 (diff | hist) . . (0) . . m 2021 AMC 10B Problems/Problem 2 (move solution 2 before video solutions)
- 02:19, 18 February 2021 (diff | hist) . . (+11) . . 2020 AIME II Problems/Problem 12 (→Solution 2 (Official MAA)) (current)
- 23:52, 13 February 2021 (diff | hist) . . (+14) . . 2021 AMC 12A Problems/Problem 25 (→Solution 2 (Fast))
- 23:51, 13 February 2021 (diff | hist) . . (+8) . . m 2021 AMC 12A Problems/Problem 25 (→Solution 2 (Fast))
- 23:48, 13 February 2021 (diff | hist) . . (+243) . . 2021 AMC 12A Problems/Problem 25 (combine solutions 2 and 3 with more rigorous justification why we can say N is a multiple of 9)
- 23:23, 13 February 2021 (diff | hist) . . (0) . . m 2021 AMC 12A Problems (→Problem 21: fix typo)
- 23:13, 13 February 2021
(diff | hist) . .
**(-529)** . . 2021 AMC 10B Problems/Problem 11 (solution 2 is exactly the same as solution 1 except x,y are used instead of m,n. Added more detail to solution 1.) - 14:14, 12 February 2021
(diff | hist) . .
**(+514)** . . 2021 AMC 12A Problems/Problem 10 (add a quick solution) - 13:13, 3 February 2021 (diff | hist) . . (+14) . . 2017 AMC 10A Problems/Problem 4
- 13:12, 3 February 2021 (diff | hist) . . (+41) . . m 2017 AMC 10A Problems/Problem 4 (→Solution)
- 13:11, 3 February 2021
(diff | hist) . .
**(-588)** . . 2017 AMC 10A Problems/Problem 4 (combine solutions 1 and 2 as they are essentially the same. also clarify that the number of toys increases by 1; not necessarily "1 toy is placed in the box" since different toys can be put in and taken out.) - 12:44, 29 January 2021 (diff | hist) . . (-14) . . User:Pi-r2 (Undo revision 143523 by Awesome3.14 (talk)) (current) (Tag: Undo)
- 12:41, 29 January 2021 (diff | hist) . . (-61) . . 2000 AMC 12 Answer Key (Undo revision 143614 by Awesome3.14 (talk) please do not vandalize the AoPS wiki pages.) (current) (Tag: Undo)
- 21:07, 2 December 2020 (diff | hist) . . (+28) . . m 2011 AMC 10B Problems/Problem 23 (need gcd(a,1000) = 1)
- 17:34, 19 November 2020
(diff | hist) . .
**(+1,493)** . . 2020 AMC 8 Problems/Problem 24 (add quick solution) - 19:27, 18 November 2020 (diff | hist) . . (+107) . . 2020 AMC 8 Problems/Problem 21 (clarify solution 1)
- 19:24, 18 November 2020
(diff | hist) . .
**(-931)** . . 2020 AMC 8 Problems/Problem 21 (Undo revision 137613 by Franzliszt (talk) this is the exact same as solution 1.) (Tag: Undo) - 12:27, 18 November 2020
(diff | hist) . .
**(+1,197)** . . 2020 AMC 8 Problems/Problem 21 (→Solution: add alternate solution without using recursion) - 16:51, 2 November 2020 (diff | hist) . . (+25) . . Tree (graph theory) (current)
- 16:50, 2 November 2020 (diff | hist) . . (+346) . . Tree (graph theory) (more complete description of a tree)
- 16:42, 2 November 2020 (diff | hist) . . (-2) . . 2020 AMC 10A Problems/Problem 6 (→Solution 1)
- 16:41, 2 November 2020
(diff | hist) . .
**(-817)** . . 2020 AMC 10A Problems/Problem 6 (improve solution 1; solutions 2 and 3 are identical to solution 1 and don't contribute anything) - 00:38, 16 July 2020
(diff | hist) . .
**(+910)** . . Mock AMC (add mock AMC 10/12) - 00:41, 1 July 2020 (diff | hist) . . (-204) . . 2019 AMC 10A Problems/Problem 2 (Solution 2 is wrong since divisibility by 100 doesn't imply the hundreds digit of their difference is 0.)
- 02:00, 30 June 2020 (diff | hist) . . (+2) . . User:Scrabbler94
- 01:59, 30 June 2020 (diff | hist) . . (+112) . . User:Scrabbler94 (add 2020 AMC 10/12)
- 01:43, 20 April 2020 (diff | hist) . . (+78) . . LaTeX:Commands (various improvements)
- 01:34, 20 April 2020 (diff | hist) . . (+10) . . m LaTeX:Commands (→Fractions: remove spacing after \frac)
- 01:33, 20 April 2020 (diff | hist) . . (-168) . . LaTeX:Commands (→Subscripts and Superscripts)
- 01:24, 20 April 2020 (diff | hist) . . (+166) . . LaTeX:Layout (→Referencing: use \eqref instead of \ref for equations)
- 01:17, 20 April 2020 (diff | hist) . . (+52) . . m LaTeX:Layout (→Document Class)
- 01:13, 20 April 2020 (diff | hist) . . (+95) . . LaTeX:Math (→Display Math: expand and improve section on equations, labeling)
- 01:01, 20 April 2020 (diff | hist) . . (-32) . . LaTeX:Symbols (→Bracketing Symbols: cases environment is more preferable than using \left\{ ....\right. esp. for piecewise functions)
- 00:49, 20 April 2020 (diff | hist) . . (-10) . . Euclidean algorithm (→Introductory)
- 02:19, 3 March 2020 (diff | hist) . . (-4) . . AMC historical results (average scores are not yet available)
- 15:38, 10 February 2020 (diff | hist) . . (-152) . . 2020 AMC 10B Problems/Problem 5 (Undo revision 117585 by Fidgetboss 4000 (talk)) (Tag: Undo)
- 15:37, 10 February 2020 (diff | hist) . . (-26) . . 2020 AMC 10B Problems/Problem 5 (Undo revision 117586 by Fidgetboss 4000 (talk)) (Tag: Undo)
- 22:42, 1 February 2020 (diff | hist) . . (+1) . . m 2020 AMC 10A Problems (→Problem 12: sp. isosceles)
- 20:30, 24 January 2020 (diff | hist) . . (+29) . . 2014 AMC 10A Problems (revert this page's vandalism)
- 00:04, 24 January 2020
(diff | hist) . .
**(-579)** . . 2004 AMC 10B Problems/Problem 21 (→Solution: solution 2 isn't really correct as the positions of the terms which appear in both sequences change after shifting.) - 14:59, 9 December 2019 (diff | hist) . . (-212) . . 2009 AMC 10B Problems/Problem 21 (Solution 3 is incorrect)
- 14:43, 29 November 2019
(diff | hist) . .
**(-574)** . . 2005 AMC 12B Problems/Problem 11 (Solution 3 is incorrect. Cannot simply apply expected value arguments like that.) - 02:23, 27 November 2019 (diff | hist) . . (-314) . . 2019 AMC 8 Problems/Problem 13 (solutions 1&2 identical; for completeness, solution should check that 110 actually works)
- 18:52, 25 November 2019 (diff | hist) . . (+98) . . 2019 AMC 8 Problems/Problem 25 (→Solution 1: improve clarity, rigor of solution 1)
- 23:56, 23 November 2019
(diff | hist) . .
**(+947)** . . 2002 AMC 12A Problems/Problem 16 (→Solution 3: existing solution 3 does not justify the symmetry, and we can't say in general that just because E(Tina's sum) = 6, we can just look for the probability that Sergio's # is >6.) - 17:08, 22 November 2019 (diff | hist) . . (+56) . . 2019 AMC 8 Problems/Problem 20 (condense solutions 1 and 2 to a more complete solution. Simply stating that the equation is quartic is not sufficient to show there are 4 real solutions.)
- 04:24, 22 November 2019 (diff | hist) . . (-12) . . m 2019 AMC 8 Problems/Problem 23 (→Solution 2: simplify solution 2 a bit)
- 04:20, 22 November 2019 (diff | hist) . . (+13) . . 2019 AMC 8 Problems/Problem 23 (→Solution 2)
- 04:20, 22 November 2019
(diff | hist) . .
**(+669)** . . 2019 AMC 8 Problems/Problem 23 (→Solution 1: alternate solution) - 04:04, 22 November 2019 (diff | hist) . . (-109) . . 2019 AMC 8 Problems/Problem 20 (Solution 2 is incorrect as the fact that it is a quartic does not imply all 4 solutions are real.)
- 19:47, 31 August 2019 (diff | hist) . . (-167) . . 2000 AMC 8 Problems (→Problem 6)
- 19:47, 31 August 2019 (diff | hist) . . (+196) . . 2000 AMC 8 Problems (→Problem 6)
- 15:09, 30 May 2019 (diff | hist) . . (+348) . . m 2017 AMC 10A Problems/Problem 25 (Undo revision 106043 by Scrabbler94 (talk)) (Tag: Undo)
- 15:08, 30 May 2019 (diff | hist) . . (-346) . . 2017 AMC 10A Problems/Problem 25 (solution 4 is incorrect, since not every multiple of 11 has at most 3 permutations (e.g. 132 has six))
- 12:32, 4 May 2019 (diff | hist) . . (-71) . . AoPS Wiki:FAQ (→The sit admins are being mean)
- 01:34, 19 April 2019
(diff | hist) . .
**(+3,789)** . . 2019 USAJMO Problems/Problem 1 (→Solution: add solution) - 18:05, 22 March 2019
(diff | hist) . .
**(+1,656)** . . 2019 AIME II Problems/Problem 12 (→Solution: add solution) - 17:17, 22 March 2019 (diff | hist) . . (+452) . . 2019 AIME II Problems/Problem 12 (add problem)
- 17:05, 22 March 2019 (diff | hist) . . (+486) . . 2019 AIME II Problems/Problem 10 (add problem)
- 17:04, 22 March 2019
(diff | hist) . .
**(+1,705)** . . 2019 AIME II Problems/Problem 9 (add solution) - 16:43, 22 March 2019
(diff | hist) . .
**(+1,309)** . . 2019 AIME II Problems/Problem 8 (add solution) - 16:29, 22 March 2019
(diff | hist) . .
**(+2,183)** . . 2019 AIME II Problems/Problem 4 (add solution) - 16:20, 22 March 2019 (diff | hist) . . (+73) . . 2019 AIME II Problems/Problem 3 (add AIME box)
- 16:16, 22 March 2019
(diff | hist) . .
**(+945)** . . 2019 AIME II Problems/Problem 3 (add solution) - 13:57, 15 March 2019
(diff | hist) . .
**(+869)** . . 2019 AIME I Problems/Problem 6 (→Solution (Similar triangles): add alternate solution) - 18:00, 16 February 2019 (diff | hist) . . (-89) . . m 2019 AMC 10B Problems/Problem 23 (→Solution 3)
- 15:51, 14 February 2019 (diff | hist) . . (+178) . . 2019 AMC 12B Problems/Problem 19 (add choices)
- 15:47, 14 February 2019 (diff | hist) . . (+13) . . 2019 AMC 12B Problems/Problem 13 (→Solution 2 (variant))
- 15:47, 14 February 2019
(diff | hist) . .
**(+665)** . . 2019 AMC 12B Problems/Problem 13 (→Solution: alternate solution) - 15:40, 14 February 2019 (diff | hist) . . (+118) . . 2019 AMC 12B Problems/Problem 14 (previous answer was incorrect)
- 15:31, 14 February 2019 (diff | hist) . . (+118) . . 2019 AMC 12B Problems/Problem 14 (→Problem: add choices)
- 15:27, 14 February 2019 (diff | hist) . . (+76) . . 2019 AMC 10B Problems/Problem 16 (→Solution)
- 15:25, 14 February 2019
(diff | hist) . .
**(+1,170)** . . 2019 AMC 10B Problems/Problem 16 (add solution) - 17:42, 25 January 2019 (diff | hist) . . (-21) . . User:Scrabbler94
- 14:26, 22 January 2019 (diff | hist) . . (+173) . . m Mock MathCounts (→State: urls to answers/results)
- 02:22, 14 January 2019 (diff | hist) . . (+152) . . m AoPS Past Contests (→Mock Contests: add ref to mock contests forum)
- 21:53, 3 January 2019 (diff | hist) . . (+233) . . Mock AMC (link to Mock Contests forum, clarify that AMC refers to the American Mathematics Competitions)
- 21:50, 3 January 2019 (diff | hist) . . (+258) . . Mock MathCounts (→Past Mock MATHCOUNTS: 1-5 difficulty obsolete; add another mock MATHCOUNTS; also include ongoing contests)
- 21:50, 1 January 2019 (diff | hist) . . (-18) . . User:Scrabbler94
- 02:01, 27 December 2018 (diff | hist) . . (+132) . . m User:Scrabbler94 (upcoming mock contest)
- 19:00, 26 November 2018
(diff | hist) . .
**(-887)** . . 2018 AMC 8 Problems/Problem 22 (solution 1.5 is almost exactly the same as solution 1) - 02:37, 22 November 2018 (diff | hist) . . (+246) . . m Mock MathCounts (usually stylized as MATHCOUNTS, not MathCounts.)
- 19:48, 21 November 2018
(diff | hist) . .
**(+535)** . . m 2017 USAMO Problems/Problem 2 (→Problem: added full text of problem) (current) - 19:46, 21 November 2018 (diff | hist) . . (+47) . . m User:Scrabbler94
- 18:33, 21 November 2018
(diff | hist) . .
**(+978)** . . 2018 AMC 8 Problems/Problem 19 (→Solution: previous solution was quite poor as it's not immediately obvious why half of all assignments of +/- give a + on top.) - 18:22, 21 November 2018
(diff | hist) . .
**(+737)** . . 2018 AMC 8 Problems/Problem 22 (→Problem 22: add solution) - 21:54, 1 November 2018
(diff | hist) . .
**(-1,155)** . . Pythagorean Theorem (Undo revision 98298 by Yeskay (talk)) - 11:16, 23 October 2018 (diff | hist) . . (-378) . . 2017 AMC 8 Problems/Problem 7 (Deleted sol. 3 as it is essentially the same as sol. 1)
- 19:43, 19 September 2018
(diff | hist) . .
**(+738)** . . AoPS Wiki:FAQ (add FAQ on mock contests, expand LaTeX) - 17:12, 17 July 2018 (diff | hist) . . (+235) . . 2013 AMC 10A Problems/Problem 14 (→Solution: alternate solution)
- 06:18, 26 June 2018 (diff | hist) . . (+3) . . m Mock MathCounts (fix formatting by inserting closing brace)
- 17:36, 19 June 2018 (diff | hist) . . (-15) . . m 2015 AMC 12A Problems (→Problem 14: fix typesetting - use \log instead of \text{log})
- 14:16, 25 May 2018
(diff | hist) . .
**(-1,649)** . . 1959 IMO Problems/Problem 1 (solution 1 incorrect, confusingly worded) - 19:57, 23 May 2018 (diff | hist) . . (+284) . . User:Scrabbler94
- 19:47, 23 May 2018 (diff | hist) . . (-3) . . User:Scrabbler94
- 19:47, 23 May 2018 (diff | hist) . . (+34) . . User:Scrabbler94
- 19:44, 23 May 2018 (diff | hist) . . (+500) . . N User:Scrabbler94 (Created page with "My username is Scrabbler94. <b>Bio:</b> *MIT '16, major 18-C (Mathematics with computer science) *Ph.D. student in computer science *I play in NASPA-sanctioned Scrabble tourn...")
- 18:43, 23 May 2018 (diff | hist) . . (-267) . . 2005 AMC 12B Problems/Problem 21 (→Solution: original solution wasn't quite correct since the prime factorization might not be p^1q^1r^2s^4. Improved solution using more standard notation and multiplicativity of d(n).)
- 14:47, 23 May 2018 (diff | hist) . . (+280) . . 2016 AMC 10B Problems (Please do not vandalize wiki pages)
- 12:53, 18 May 2018 (diff | hist) . . (-14) . . 2007 AMC 12A Problems/Problem 16 (→Solution 2)
- 12:52, 18 May 2018
(diff | hist) . .
**(+964)** . . 2007 AMC 12A Problems/Problem 16 (→Solution: add alternate solution with a little less listing out possibilities) - 18:40, 17 May 2018 (diff | hist) . . (-179) . . 2012 AMC 10B Problems/Problem 15 (expanded solution 1, removed solution 2 as it doesn't do anything constructive)
- 01:28, 13 May 2018 (diff | hist) . . (+18) . . 2016 AMC 8 Problems (→Problem 12: added clause "on the field trip")
- 13:35, 9 April 2018 (diff | hist) . . (-4) . . m Millennium Problems (formatting with dollar sign) (current)
- 13:32, 9 April 2018 (diff | hist) . . (-203) . . Arithmetic Mean-Geometric Mean Inequality (→Extensions: removed extremely vague bullet point. Explain better and put a source!)
- 17:00, 9 March 2018 (diff | hist) . . (0) . . 2018 AIME I Problems/Problem 14 (fix typo)
- 16:57, 9 March 2018 (diff | hist) . . (+13) . . 2018 AIME I Problems/Problem 14 (→Solution)
- 16:56, 9 March 2018
(diff | hist) . .
**(+1,422)** . . 2018 AIME I Problems/Problem 14 (→Solution: add more complete solution with DP table) - 02:00, 5 March 2018 (diff | hist) . . (+33) . . AoPS Wiki:FAQ (→AoPS Acronyms: added FTFY, a relatively common forum acronym)
- 12:58, 26 February 2018 (diff | hist) . . (-2) . . m Mock MathCounts (→State)
- 12:58, 26 February 2018
(diff | hist) . .
**(+515)** . . Mock MathCounts (→State: add a mock 2018 state round) - 17:07, 22 February 2018 (diff | hist) . . (+357) . . Mersenne prime (update largest known Mersenne prime; connection with even perfect numbers)
- 16:19, 21 February 2018 (diff | hist) . . (-70) . . AMC 10 Problems and Solutions (we are still months away from 2019; no point in inserting dead links)
- 20:26, 8 February 2018 (diff | hist) . . (+2) . . 2018 AMC 10A Problems (→Problem 3)
- 23:41, 21 January 2018 (diff | hist) . . (-30) . . Mock MathCounts (→Tips for Writing a Mock MathCounts: bolded the 1st sentence in each bullet, reordered some tips, removed the tip saying it is okay to use past contest problems (generally it's frowned upon).)
- 02:23, 17 January 2018 (diff | hist) . . (+88) . . Mock AMC (→Mock AMC 10: link to discussion)
- 01:47, 17 January 2018 (diff | hist) . . (+459) . . Mock AMC (→Mock AMC 10: add a mock AMC 10)
- 15:20, 25 October 2017 (diff | hist) . . (+322) . . Millennium Problems (→P versus NP: definitions of P/NP/NP-complete were incorrect, gave a brief but more correct overview)
- 15:11, 25 October 2017 (diff | hist) . . (+1) . . P versus NP (→Importance: sp. millennium) (current)
- 15:11, 25 October 2017 (diff | hist) . . (+85) . . m P versus NP (→Examples of P, NP, NP-complete problems: run time of brute-force subset sum)
- 15:05, 25 October 2017 (diff | hist) . . (+37) . . m P versus NP (→Overview)
- 15:04, 25 October 2017
(diff | hist) . .
**(-938)** . . P versus NP (→Examples of P, NP, NP-complete problems) - 15:03, 25 October 2017 (diff | hist) . . (-12) . . m P versus NP (→Examples of problems in P, NP, NP-complete problems)
- 15:02, 25 October 2017
(diff | hist) . .
**(+1,333)** . . P versus NP (→Arguments: more clearly define NP-completeness, give examples of NP/NP-complete problems) - 14:39, 25 October 2017
(diff | hist) . .
**(+973)** . . P versus NP (→Overview: more formally define P, NP, decidability) - 13:30, 25 October 2017
(diff | hist) . .
**(+1,109)** . . Graph (graph theory) (add definitions of strongly connected, complete bipartite graphs) - 13:23, 25 October 2017 (diff | hist) . . (+2) . . m Graph (graph theory) (→Bipartite graph)
- 13:22, 25 October 2017 (diff | hist) . . (-5) . . m Graph (graph theory) (→Bipartite graph)
- 13:22, 25 October 2017 (diff | hist) . . (+180) . . m Graph (graph theory) (→Bipartite graph: clarify definition of bipartite and that empty graph is bipartite)
- 12:02, 5 February 2015 (diff | hist) . . (+90) . . 2015 AMC 12A Problems/Problem 2 (→Solution)
- 11:57, 5 February 2015 (diff | hist) . . (+2) . . 2015 AMC 10A Problems/Problem 1 (→Solution)
- 11:57, 5 February 2015 (diff | hist) . . (-123) . . 2015 AMC 10A Problems/Problem 1 (→Solution)
- 02:02, 29 December 2014 (diff | hist) . . (+120) . . Combinatorial identity (→Hat Proof)
- 23:27, 1 July 2014 (diff | hist) . . (+187) . . 2001 AMC 10 Problems/Problem 12 (→Solution)
- 16:43, 8 April 2014 (diff | hist) . . (+24) . . AoPS Wiki:AoPS Community Awards (→Perfect AMC 10 scorers)
- 16:08, 10 August 2013 (diff | hist) . . (+12) . . 2003 AIME I Problems/Problem 12 (→Solution 1)
- 16:07, 10 August 2013 (diff | hist) . . (-87) . . 2003 AIME I Problems/Problem 12 (→Solution 1: easier solution 1)