# User contributions

- 13:04, 21 February 2014 (diff | hist) . . (+1) . . m 2014 AMC 10B Problems/Problem 21 (→Solution)
- 11:31, 22 February 2013 (diff | hist) . . (0) . . 2013 AMC 10B Problems/Problem 24 (→Solution)
- 11:25, 22 February 2013 (diff | hist) . . (+5) . . m 2013 AMC 10B Problems/Problem 2
- 20:30, 2 November 2012 (diff | hist) . . (+24) . . 2009 AMC 10A Answer Key
- 20:30, 2 November 2012 (diff | hist) . . (+140) . . N 2009 AMC 10A Answer Key (Created page with "1. E 2. A 3. C 4. A 5. E 6. A 7. C 8. B 9. B 10. B 11. D 12. C 13. E 14. A 15. E 16. D 17. C 18. D 19. B 20. D 21. C 22. D 23. E 24. C 25. B")
- 20:29, 2 November 2012 (diff | hist) . . (+28) . . 2009 AMC 10A
- 20:27, 2 November 2012 (diff | hist) . . (+1) . . m 2009 AMC 10A Problems/Problem 18 (→Solution 1)
- 20:24, 2 November 2012 (diff | hist) . . (+7) . . m 2009 AMC 12A Problems/Problem 5 (→Solution)
- 20:24, 2 November 2012 (diff | hist) . . (+14) . . m 2009 AMC 12A Problems/Problem 5 (→Solution)
- 20:24, 2 November 2012 (diff | hist) . . (+20) . . m 2009 AMC 10A Problems/Problem 10 (→Solution)
- 20:23, 2 November 2012 (diff | hist) . . (+13) . . m 2009 AMC 10A Problems/Problem 9
- 22:52, 1 November 2012 (diff | hist) . . (+2) . . m 2011 AMC 10A Problems/Problem 24 (→Solution)
- 22:52, 1 November 2012 (diff | hist) . . (+7) . . m 2011 AMC 10A Problems/Problem 24 (→Solution)
- 22:23, 28 October 2012 (diff | hist) . . (+2) . . m Right triangle (→Special right triangles)
- 22:22, 28 October 2012 (diff | hist) . . (+80) . . m Right triangle (→Special right triangles)
- 20:29, 19 August 2012 (diff | hist) . . (+29) . . m 1997 AIME Problems/Problem 11 (→Solution 3)
- 23:41, 7 July 2012 (diff | hist) . . (0) . . m 2012 AIME II Problems/Problem 9 (→The Second Term)
- 19:36, 30 May 2012 (diff | hist) . . (+1) . . Vector
- 18:37, 11 May 2012 (diff | hist) . . (+53) . . MATHCOUNTS
- 18:36, 11 May 2012 (diff | hist) . . (+22) . . MATHCOUNTS (→Past State Team Winners)
- 18:36, 11 May 2012 (diff | hist) . . (+27) . . MATHCOUNTS (→Past Winners)
- 20:26, 3 April 2012
(diff | hist) . .
**(+2,271)** . . 2012 AIME II Problems/Problem 9 (→Solution) - 16:13, 31 March 2012
(diff | hist) . .
**(+637)** . . N 2012 AIME II Problems/Problem 15 (Created page with "== Problem 15 == Triangle <math>ABC</math> is inscribed in circle <math>\omega</math> with <math>AB=5</math>, <math>BC=7</math>, and <math>AC=3</math>. The bisector of angle <mat...") - 16:12, 31 March 2012 (diff | hist) . . (+430) . . N 2012 AIME II Problems/Problem 14 (Created page with "== Problem 14 == In a group of nine people each person shakes hands with exactly two of the other people from the group. Let <math>N</math> be the number of ways this handshaking...")
- 16:11, 31 March 2012 (diff | hist) . . (+351) . . N 2012 AIME II Problems/Problem 13 (Created page with "== Problem 13 == Equilateral <math>\triangle ABC</math> has side length <math>\sqrt{111}</math>. There are four distinct triangles <math>AD_1E_1</math>, <math>AD_1E_2</math>, <ma...")
- 16:11, 31 March 2012
(diff | hist) . .
**(+532)** . . N 2012 AIME II Problems/Problem 12 (Created page with "== Problem 12 == For a positive integer <math>p</math>, define the positive integer <math>n</math> to be <math>p</math>''-safe'' if <math>n</math> differs in absolute value by mo...") - 16:10, 31 March 2012 (diff | hist) . . (+371) . . N 2012 AIME II Problems/Problem 11 (Created page with "== Problem 11 == Let <math>f_1(x) = \frac23 - \frac3{3x+1}</math>, and for <math>n \ge 2</math>, define <math>f_n(x) = f_1(f_{n-1}(x))</math>. The value of <math>x</math> that sa...")
- 16:09, 31 March 2012 (diff | hist) . . (+302) . . N 2012 AIME II Problems/Problem 10 (Created page with "== Problem 10 == Find the number of positive integers <math>n</math> less than <math>1000</math> for which there exists a positive real number <math>x</math> such that <math>n=x\...")
- 16:09, 31 March 2012 (diff | hist) . . (+399) . . N 2012 AIME II Problems/Problem 9 (Created page with "== Problem 9 == Let <math>x</math> and <math>y</math> be real numbers such that <math>\frac{\sin x}{\sin y} = 3</math> and <math>\frac{\cos x}{\cos y} = \frac12</math>. The value...")
- 16:08, 31 March 2012 (diff | hist) . . (+222) . . N 2012 AIME II Problems/Problem 8 (Created page with "== Problem 8 == The complex numbers <math>z</math> and <math>w</math> satisfy the system <cmath> z + \frac{20i}w = 5+i \\ \\ w+\frac{12i}z = -4+10i </cmath> Find the smallest pos...")
- 16:07, 31 March 2012 (diff | hist) . . (+274) . . N 2012 AIME II Problems/Problem 7 (Created page with "== Problem 7 == Let <math>S</math> be the increasing sequence of positive integers whose binary representation has exactly <math>8</math> ones. Let <math>N</math> be the 1000th n...")
- 16:07, 31 March 2012 (diff | hist) . . (+127) . . 2012 AIME II Problems/Problem 6
- 16:05, 31 March 2012
(diff | hist) . .
**(+966)** . . N 2012 AIME II Problems/Problem 5 (Created page with "== Problem 5 == In the accompanying figure, the outer square <math>S</math> has side length <math>40</math>. A second square <math>S'</math> of side length <math>15</math> is con...") - 16:04, 31 March 2012
(diff | hist) . .
**(+1,009)** . . N 2012 AIME II Problems/Problem 4 (Created page with "== Problem 4 == Ana, Bob, and Cao bike at constant rates of <math>8.6</math> meters per second, <math>6.2</math> meters per second, and <math>5</math> meters per second, respecti...") - 16:03, 31 March 2012 (diff | hist) . . (+453) . . N 2012 AIME II Problems/Problem 3 (Created page with "== Problem 3 == At a certain university, the division of mathematical sciences consists of the departments of mathematics, statistics, and computer science. There are two male an...")
- 16:02, 31 March 2012 (diff | hist) . . (+245) . . N 2012 AIME II Problems/Problem 2 (Created page with "== Problem 2 == Two geometric sequences <math>a_1, a_2, a_3, \ldots</math> and <math>b_1, b_2, b_3, \ldots</math> have the same common ratio, with <math>a_1 = 27</math>, <math>b_...")
- 16:00, 31 March 2012 (diff | hist) . . (+145) . . N 2012 AIME II Problems/Problem 1 (Created page with "== Problem 1 == Find the number of ordered pairs of positive integer solutions <math>(m, n)</math> to the equation <math>20m + 12n = 2012</math>.")
- 18:46, 30 March 2012 (diff | hist) . . (+14) . . m 2012 AIME II Answer Key
- 20:29, 25 March 2012 (diff | hist) . . (+13) . . m 2009 AIME I Problems/Problem 11 (→Solution 2)
- 16:23, 25 March 2012 (diff | hist) . . (+12) . . m 2009 AIME I Problems/Problem 11 (→Solution 2)
- 16:07, 25 March 2012
(diff | hist) . .
**(+2,729)** . . 2009 AIME I Problems/Problem 11 (→Solution) - 23:51, 15 March 2012 (diff | hist) . . (+6) . . m Rational Root Theorem (→Proof)
- 23:51, 15 March 2012 (diff | hist) . . (+37) . . m Rational Root Theorem (→Proof)
- 23:00, 11 March 2012 (diff | hist) . . (+46) . . 2012 AMC 12B Problems/Problem 12 (→Solution 1)
- 14:56, 11 March 2012 (diff | hist) . . (-172) . . User:Williamhu888 (Blanked the page) (current)
- 00:03, 9 March 2012 (diff | hist) . . (+21) . . m 2006 AIME I Problems/Problem 8 (→Solution)
- 01:27, 3 March 2012 (diff | hist) . . (0) . . m 2005 AIME II Problems/Problem 5 (→Solution)
- 15:02, 25 February 2012 (diff | hist) . . (+8) . . m 2004 AIME II Problems/Problem 1 (→Solution)
- 15:31, 19 February 2012 (diff | hist) . . (+8) . . m 2003 AIME II Problems/Problem 7
- 19:28, 18 February 2012 (diff | hist) . . (+113) . . 2003 AIME I Problems/Problem 3
- 22:59, 11 February 2012 (diff | hist) . . (-60) . . 2001 AIME II Problems/Problem 7
- 22:57, 11 February 2012 (diff | hist) . . (+319) . . 2001 AIME II Problems/Problem 7
- 23:41, 9 February 2012 (diff | hist) . . (+9) . . 2012 AMC 10A Problems/Problem 24
- 01:10, 10 December 2011 (diff | hist) . . (-6) . . m MATHCOUNTS (→Rewards)
- 01:09, 10 December 2011 (diff | hist) . . (+29) . . m MATHCOUNTS (→Countdown Round)
- 19:04, 24 November 2011 (diff | hist) . . (+25) . . California MathCounts
- 19:04, 24 November 2011 (diff | hist) . . (+48) . . California MathCounts (→History)
- 12:24, 8 August 2011 (diff | hist) . . (+27) . . m Completing the square
- 19:55, 25 July 2011
(diff | hist) . .
**(+780)** . . AoPS Wiki talk:Problem of the Day/July 25, 2011 (current) - 19:50, 25 July 2011 (diff | hist) . . (+63) . . N AoPS Wiki talk:Problem of the Day/July 25, 2011 (Created page with "Find the remainder when <math>2^{2011}</math> is divided by 11.")
- 00:00, 17 July 2011 (diff | hist) . . (+3) . . m Set (→Empty Set) (current)
- 20:43, 14 July 2011
(diff | hist) . .
**(+544)** . . MATHCOUNTS - 20:32, 14 July 2011 (diff | hist) . . (+11) . . m MATHCOUNTS (→Past Winners)
- 21:29, 1 July 2011 (diff | hist) . . (-1) . . m Completing the square (→General Solution For A Quadratic by Completing the Square)
- 11:01, 1 July 2011 (diff | hist) . . (0) . . m Trigonometric identities (→Even-Odd Identities)
- 10:57, 1 July 2011 (diff | hist) . . (-11) . . m AoPS Wiki talk:Problem of the Day/July 1, 2011
- 20:22, 30 June 2011 (diff | hist) . . (+1) . . m AoPS Wiki talk:Problem of the Day/July 1, 2011
- 20:20, 30 June 2011
(diff | hist) . .
**(+745)** . . AoPS Wiki talk:Problem of the Day/July 1, 2011 - 20:10, 30 June 2011 (diff | hist) . . (+18) . . AoPS Wiki talk:Problem of the Day/July 1, 2011
- 20:10, 30 June 2011 (diff | hist) . . (-18) . . AoPS Wiki talk:Problem of the Day/July 1, 2011 (→Solution)
- 19:25, 28 June 2011 (diff | hist) . . (+172) . . N User:Williamhu888 (Created page with "Hey guys, take a look at this: Anybody know Sean Shi who was part of the national Mathcounts team that won this year? I know him a lot and my mom is close friends with his.")
- 20:55, 20 June 2011 (diff | hist) . . (+23) . . Quadratic equation (→See Also)
- 20:50, 20 June 2011 (diff | hist) . . (+1) . . m Vieta's Formulas
- 20:50, 20 June 2011 (diff | hist) . . (+117) . . m Vieta's Formulas
- 14:01, 18 April 2011 (diff | hist) . . (+69) . . Icosidigon (current)
- 14:01, 18 April 2011 (diff | hist) . . (+123) . . N Icosidigon (Created page with 'An '''icosidigon''' is a polygon with 22 sides. ==See Also== * Polygon * Geometry Category:Geometry {{stub}}')
- 13:59, 18 April 2011 (diff | hist) . . (+191) . . N Pentacontakaidigon (Created page with 'A '''pentacontakaidigon''' is a polygon with 52 sides. The sum of its interior angles is <math>9000^{\circ}</math>. ==See Also== * Polygon * Geometry [[Category:Geometr…') (current)
- 13:57, 18 April 2011 (diff | hist) . . (+1) . . Icosihenagon
- 13:56, 18 April 2011 (diff | hist) . . (+124) . . N Icosihenagon (Created page with 'An ''icosihenagon''' is a polygon with 21 sides. ==See Also== * Polygon * Geometry Category:Geometry {{stub}}')
- 13:55, 18 April 2011 (diff | hist) . . (+1) . . Icosagon (current)
- 13:55, 18 April 2011 (diff | hist) . . (+120) . . N Icosagon (Created page with 'An ''icosagon''' is a polygon with 20 sides. ==See Also== * Polygon * Geometry Category:Geometry {{stub}}')
- 13:54, 18 April 2011 (diff | hist) . . (+123) . . N Nonadecagon (Created page with 'A '''nonadecagon''' is a polygon with 19 sides. ==See Also== * Polygon * Geometry Category:Geometry {{stub}}') (current)
- 13:53, 18 April 2011 (diff | hist) . . (+124) . . N Octadecagon (Created page with 'An '''octadecagon''' is a polygon with 18 sides. ==See Also== * Polygon * Geometry Category:Geometry {{stub}}') (current)
- 13:52, 18 April 2011 (diff | hist) . . (+124) . . N Heptadecagon (Created page with 'A '''heptadecagon''' is a polygon with 17 sides. ==See Also== * Polygon * Geometry Category:Geometry {{stub}}') (current)
- 13:52, 18 April 2011 (diff | hist) . . (+183) . . N Hexadecagon (Created page with 'A '''hexadecagon''' is a polygon with 16 sides. The sum of its angle measures is <math>2520^{\circ}</math>. ==See Also== * Polygon * Geometry Category:Geometry {{s…') (current)
- 13:51, 18 April 2011 (diff | hist) . . (+124) . . N Pentadecagon (Created page with 'A '''pentadecagon''' is a polygon with 15 sides. ==See Also== * Polygon * Geometry Category:Geometry {{stub}}') (current)
- 13:51, 18 April 2011 (diff | hist) . . (+124) . . N Tetradecagon (Created page with 'A '''tetradecagon''' is a polygon with 14 sides. ==See Also== * Polygon * Geometry Category:Geometry {{stub}}') (current)
- 13:50, 18 April 2011 (diff | hist) . . (+122) . . N Tridecagon (Created page with 'A '''tridecagon''' is a polygon with 13 sides. ==See Also== * Polygon * Geometry Category:Geometry {{stub}}')
- 13:49, 18 April 2011 (diff | hist) . . (+26) . . Dodecagon
- 13:48, 18 April 2011 (diff | hist) . . (+122) . . N Hendecagon (Created page with 'A '''hendecagon''' is a polygon with 11 sides. ==See Also== * Polygon * Geometry Category:Geometry {{stub}}') (current)
- 13:47, 18 April 2011 (diff | hist) . . (+123) . . N Heptagon (Created page with 'A '''heptagon''' is a polygon with seven sides. ==See Also== * Polygon * Geometry Category:Geometry {{stub}}')
- 13:47, 18 April 2011 (diff | hist) . . (+120) . . N Decagon (Created page with 'A '''decagon''' is a polygon with ten sides. ==See Also== * Polygon * Geometry Category:Geometry {{stub}}') (current)
- 22:31, 6 April 2011 (diff | hist) . . (+104) . . Prime number (→Fermat Primes)
- 21:56, 2 April 2011 (diff | hist) . . (-282) . . Math Olympiads for Elementary and Middle Schools (→George Lechner's Passing Away)
- 21:54, 2 April 2011 (diff | hist) . . (+34) . . Factorial (→Additional Information)
- 00:45, 30 March 2011 (diff | hist) . . (-258) . . Deficient number (Blanked the page)
- 00:43, 30 March 2011 (diff | hist) . . (+57) . . Deficient number
- 00:42, 30 March 2011 (diff | hist) . . (+201) . . N Deficient number (Created page with 'A positive integer <math>n</math> is abundant if it is smaller than the sum of its factors. == Examples == 3 is abundant because the sum of its factors is greater than itself; i…')
- 00:33, 30 March 2011 (diff | hist) . . (+225) . . Factorial (→Examples)
- 00:30, 30 March 2011 (diff | hist) . . (+99) . . Factorial (→See Also)
- 00:23, 30 March 2011
(diff | hist) . .
**(-2,515)** . . Factorial (→Examples) - 00:22, 30 March 2011
(diff | hist) . .
**(+2,596)** . . Factorial (→Examples) - 00:20, 30 March 2011 (diff | hist) . . (+24) . . Factorial (→Examples)
- 00:20, 30 March 2011
(diff | hist) . .
**(+958)** . . Factorial (→Examples) - 21:19, 29 March 2011 (diff | hist) . . (-86) . . Factorial (→Examples)
- 21:06, 29 March 2011 (diff | hist) . . (+82) . . Factorial (→See Also)
- 21:05, 29 March 2011
(diff | hist) . .
**(+1,560)** . . Factorial (→Examples) - 20:55, 29 March 2011 (diff | hist) . . (-54) . . Factorial (→Examples (Factorials from 0! to 30!))
- 20:51, 29 March 2011 (diff | hist) . . (+54) . . Factorial (→Examples)
- 20:48, 29 March 2011 (diff | hist) . . (+55) . . Factorial (→Examples)
- 20:48, 29 March 2011 (diff | hist) . . (+430) . . Factorial
- 20:45, 29 March 2011
(diff | hist) . .
**(+635)** . . Factorial - 22:47, 27 March 2011 (diff | hist) . . (+220) . . Perfect number (current)
- 03:33, 6 February 2011
(diff | hist) . .
**(+1,291)** . . N Powers of 2 (Created page with 'A power of 2 means a number of the form <math>2^n</math>, in which <math>n</math> is an integer. ==First 43 powers of 2== <math>2^0=1</math> <math>2^1=2</math> <math>2^2=4</mat…') - 16:15, 31 December 2010 (diff | hist) . . (0) . . m Pi (current)
- 16:11, 31 December 2010 (diff | hist) . . (+84) . . Integer
- 16:09, 31 December 2010 (diff | hist) . . (+99) . . Natural number (current)
- 16:04, 31 December 2010 (diff | hist) . . (0) . . Digit (current)
- 18:53, 30 December 2010 (diff | hist) . . (0) . . m Zero (constant) (→Operations with 0)
- 18:52, 30 December 2010 (diff | hist) . . (+28) . . Zero (constant) (→Operations with 0)
- 18:52, 30 December 2010 (diff | hist) . . (+99) . . Zero (constant)
- 18:50, 30 December 2010 (diff | hist) . . (+83) . . Zero (constant) (→Operations with 0)
- 18:48, 30 December 2010 (diff | hist) . . (+25) . . Zero (constant) (→Operations with 0)
- 18:47, 30 December 2010 (diff | hist) . . (+12) . . Zero (constant) (→Operations with 0)
- 18:46, 30 December 2010
(diff | hist) . .
**(+563)** . . Zero (constant) - 18:38, 30 December 2010 (diff | hist) . . (+388) . . Common Multiplication (current)
- 18:30, 30 December 2010 (diff | hist) . . (+97) . . Common Multiplication
- 18:28, 30 December 2010 (diff | hist) . . (+47) . . Addition
- 14:16, 29 December 2010 (diff | hist) . . (-1) . . Math Olympiads for Elementary and Middle Schools
- 14:15, 29 December 2010 (diff | hist) . . (-3) . . Math Olympiads for Elementary and Middle Schools (→George Lechner's Passing Away)
- 14:11, 29 December 2010 (diff | hist) . . (+25) . . Math Olympiads for Elementary and Middle Schools (→George Lechner's Passing Away)
- 14:10, 29 December 2010 (diff | hist) . . (+40) . . Math Olympiads for Elementary and Middle Schools (→George Lechner's Passing Away)
- 14:09, 29 December 2010 (diff | hist) . . (+219) . . Math Olympiads for Elementary and Middle Schools
- 13:57, 29 December 2010 (diff | hist) . . (+97) . . AoPSWiki
- 13:36, 29 December 2010 (diff | hist) . . (+1) . . Richard Rusczyk
- 13:35, 29 December 2010 (diff | hist) . . (+77) . . Richard Rusczyk
- 13:29, 29 December 2010 (diff | hist) . . (+1) . . m Divisibility rules (→Divisibility Rule for 2 and Powers of 2)
- 13:28, 29 December 2010 (diff | hist) . . (-1) . . m Divisibility rules (→Divisibility Rule for 10 and Powers of 10)
- 13:28, 29 December 2010 (diff | hist) . . (+250) . . Divisibility rules (→Divisibility Rule for 10)
- 13:23, 29 December 2010 (diff | hist) . . (+45) . . Division
- 22:38, 28 December 2010 (diff | hist) . . (0) . . m Base numbers (→Beginner)
- 22:38, 28 December 2010 (diff | hist) . . (+10) . . m Base numbers (→Beginner)
- 22:35, 28 December 2010 (diff | hist) . . (+9) . . m Division
- 22:35, 28 December 2010 (diff | hist) . . (+222) . . Division
- 22:27, 28 December 2010 (diff | hist) . . (+158) . . Common Multiplication
- 22:06, 28 December 2010 (diff | hist) . . (+65) . . Addition
- 22:03, 28 December 2010 (diff | hist) . . (+98) . . Divisibility rules