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Forum: Challenge Questions and Puzzles

Have a challenging question or puzzle you want to share with the community? Post it here (homework questions do NOT belong here).

  1. Sticky Thread Sticky Threads

    • Replies: 1
    • Views: 1,755
    October 8th, 2013, 03:20 Go to last post
  1. Normal Thread Normal Threads

  2. high school inequality 5

    Started by solakis, June 4th, 2017 07:02
    aleq, alongrghtarrow, bleq, bwedge, high
    • Replies: 5
    • Views: 193
    June 15th, 2017, 22:20 Go to last post
  3. The Durango Curve Problem

    Started by rick123, June 1st, 2017 16:38
    2 Pages
    1 2
    • Replies: 10
    • Views: 275
    June 3rd, 2017, 19:58 Go to last post
  4. high school inequality 4

    Started by solakis, June 2nd, 2017 13:22
    find, high, inequality, school, sqrtx-1^2+y-2^2
    • Replies: 0
    • Views: 73
    June 2nd, 2017, 13:22 Go to last post
  5. Year 7 & 8 mathematics puzzle

    Started by bio, May 27th, 2017 03:15
    1-frac12017$$, eyes, maths, remember, year
    • Replies: 5
    • Views: 194
    May 31st, 2017, 02:29 Go to last post
  6. high school inequality 3

    Started by solakis, May 20th, 2017 03:53
    • Replies: 7
    • Views: 267
    May 23rd, 2017, 17:20 Go to last post
  7. find value of Angle BMC

    Started by Albert, May 21st, 2017 13:05
    $angle, $triangle, abc, angle, find
    • Replies: 0
    • Views: 83
    May 21st, 2017, 13:05 Go to last post
  8. find y

    Started by Albert, May 21st, 2017 12:28
    $y$, decimal, find, integer, part
    • Replies: 0
    • Views: 88
    May 21st, 2017, 12:28 Go to last post
  9. inequality 2

    Started by solakis, May 7th, 2017 20:21
    inequality, prove
    • Replies: 5
    • Views: 252
    May 8th, 2017, 17:45 Go to last post
  10. isosceles triangle

    Started by kaliprasad, May 7th, 2017 06:10
    infiinite, integer, isosceles, show, triangle
    • Replies: 2
    • Views: 136
    May 8th, 2017, 06:33 Go to last post
  11. inequality

    Started by solakis, May 5th, 2017 11:01
    inequality, prove
    • Replies: 3
    • Views: 144
    May 7th, 2017, 23:31 Go to last post
  12. Log derivative

    Started by greg1313, May 3rd, 2017 19:37
    $frac1x$, $lnx$, derivative, log, show
    • Replies: 7
    • Views: 227
    May 4th, 2017, 11:28 Go to last post
  13. A,B,C,D cocyclic

    Started by Albert, April 24th, 2017 20:21
    • Replies: 1
    • Views: 131
    April 28th, 2017, 22:23 Go to last post
  14. Regular hexagon

    Started by Albert, April 17th, 2017 23:18
    • Replies: 1
    • Views: 136
    April 25th, 2017, 21:02 Go to last post
  15. geometry to be proved

    Started by Albert, April 15th, 2017 12:02
    • Replies: 2
    • Views: 181
    April 24th, 2017, 12:01 Go to last post
  16. prove no solution

    Started by Albert, April 17th, 2017 23:01
    1x^2+dfrac1xy+dfrac, dfrac, prove, solution, yin
    • Replies: 1
    • Views: 140
    April 18th, 2017, 09:34 Go to last post
  17. find A

    Started by Albert, April 17th, 2017 22:57
    $a$4, $a=overlineabcd$, digital, find, number$=overlineabcd$
    • Replies: 2
    • Views: 144
    April 18th, 2017, 07:49 Go to last post
  18. Find remainder when

    Started by kaliprasad, April 16th, 2017 01:59
    2015, 2016-1󫢭, 2󫶚, find, remainder
    • Replies: 2
    • Views: 164
    April 17th, 2017, 00:06 Go to last post
  19. numbers of right angled triangles

    Started by Albert, April 15th, 2017 11:30
    angled, numbers, numers, points, triangles
    • Replies: 4
    • Views: 165
    April 15th, 2017, 21:50 Go to last post
  20. find value of x-y+z

    Started by Albert, April 15th, 2017 12:19
    3x-4y=0---1, find, leftbeginmatrix, x-y+z
    • Replies: 2
    • Views: 107
    April 15th, 2017, 13:10 Go to last post
  21. Sequence challenge

    Started by lfdahl, April 2nd, 2017 14:18
    $a_n, challenge, prove, sequence
    • Replies: 3
    • Views: 203
    April 6th, 2017, 09:11 Go to last post
  22. Expressing a polynomial by two other polynomials

    Started by lfdahl, March 29th, 2017 11:58
    expressing, integer, polynomial, polynomials, x-a^2x-b^2
    • Replies: 2
    • Views: 154
    April 1st, 2017, 14:55 Go to last post
  23. Total area of inscribed squares

    Started by lfdahl, March 27th, 2017 17:21
    area, circle, inscribed, square, total
    • Replies: 3
    • Views: 193
    March 28th, 2017, 16:07 Go to last post
  24. incircle and circumscribed circle

    Started by Albert, March 15th, 2017 09:53
    • Replies: 1
    • Views: 163
    March 28th, 2017, 13:13 Go to last post
  25. Prove: f(x) = 0 has infinitely many solutions

    Started by lfdahl, March 27th, 2017 11:09
    $[0;1]$, function, infinitely, prove, solutions
    • Replies: 2
    • Views: 167
    March 27th, 2017, 16:49 Go to last post
  26. Triangle inequality

    Started by lfdahl, March 20th, 2017 17:38
    inequality, prod_cycsin, prove, sum_cycsin, triangle
    • Replies: 1
    • Views: 142
    March 26th, 2017, 15:14 Go to last post
  27. prove AC^2=AB(AB+BC)

    Started by Albert, March 18th, 2017 03:39
    $triangle, abc, ac^2=abab+bc, angle, prove
    • Replies: 3
    • Views: 154
    March 18th, 2017, 11:02 Go to last post
  28. find relation equation between a,b

    Started by Albert, March 16th, 2017 10:30
    equation, find, integer, positive, relation
    • Replies: 4
    • Views: 173
    March 17th, 2017, 08:51 Go to last post
  29. find (m,n)

    Started by Albert, March 15th, 2017 09:26
    $m^2-2mn+14n^2=217$, find, nin, solutions
    • Replies: 5
    • Views: 204
    March 16th, 2017, 10:43 Go to last post
  30. no positive integer solution

    Started by Albert, March 15th, 2017 09:22
    $x^2+y^2=1992---a$, integer, positive, pove, solution
    • Replies: 1
    • Views: 161
    March 16th, 2017, 06:54 Go to last post
  31. Divisibility proved

    Started by lfdahl, March 13th, 2017 08:12
    $343$, 652, divisibility, divisible, prove
    • Replies: 2
    • Views: 191
    March 14th, 2017, 15:39 Go to last post

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