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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: 2
    • Views: 6,019
    October 15th, 2017, 16:11 Go to last post
  1. Normal Thread Normal Threads

  2. value of k in definite Integration

    Started by jacks, February 14th, 2020 10:33
    definite, displaystyle, integration
    • Replies: 0
    • Views: 418
    February 14th, 2020, 10:33 Go to last post
  3. Definite Integral Challenge

    Started by lfdahl, August 20th, 2019 16:51
    2ln2], definite, holds, natural, number
    • Replies: 6
    • Views: 1,500
    February 1st, 2020, 19:16 Go to last post
  4. Number theory problem #1

    Started by MountEvariste, December 31st, 2019 17:25
    $pne, number, prime, problem, theory
    • Replies: 1
    • Views: 672
    January 4th, 2020, 17:38 Go to last post
  5. Can we apply here logic?

    Started by Dhamnekar Winod, December 23rd, 2019 11:13
    apply, leftbeginarrayrcl, logic, x+y+z, x^2+y^2+z^2
    • Replies: 1
    • Views: 672
    December 26th, 2019, 07:56 Go to last post
  6. Exponential series limit

    Started by jacks, November 25th, 2019 10:30
    $displaystyle, evaluation, exponential, limit, series
    • Replies: 3
    • Views: 782
    November 25th, 2019, 12:40 Go to last post
  7. limit

    Started by jacks, November 13th, 2019 03:37
    displaystyle, evaluation, limit
    • Replies: 7
    • Views: 1,080
    November 25th, 2019, 10:28 Go to last post
  8. Limit with Integration

    Started by jacks, March 15th, 2019 10:35
    $$lim_nrightarrow, finding, integration, limit
    • Replies: 1
    • Views: 989
    November 13th, 2019, 03:44 Go to last post
  9. inequality

    Started by solakis, October 20th, 2019 13:25
    $frac1a$, $frac1aa+b$, frac1a, frac1aa+b, inequality
    • Replies: 7
    • Views: 1,303
    November 9th, 2019, 18:03 Go to last post
  10. axiomatics

    Started by solakis, November 1st, 2019 22:41
    axiomatics, forall, x=y], xforall, y[=
    • Replies: 0
    • Views: 796
    November 1st, 2019, 22:41 Go to last post
  11. Geometrical problem

    Started by solakis, October 19th, 2019 10:18
    geometrical, inscribed, perimeter, radius, triangle
    • Replies: 1
    • Views: 963
    October 22nd, 2019, 10:06 Go to last post
  12. logic problem

    Started by solakis, October 17th, 2019 10:19
    chris, logic, money, town, visit
    • Replies: 3
    • Views: 933
    October 19th, 2019, 07:59 Go to last post
  13. high school inequality

    Started by solakis, September 27th, 2019 14:00
    high, inequality, school
    • Replies: 4
    • Views: 1,271
    September 28th, 2019, 21:44 Go to last post
  14. high school inequality 2

    Started by solakis, September 28th, 2019 08:34
    find, high, inequality, school
    • Replies: 1
    • Views: 519
    September 28th, 2019, 15:41 Go to last post
  15. Quadrilateral Divider

    Started by Satya, September 16th, 2019 16:29
    area, divides, equal, parts, quadrilateral
    • Replies: 4
    • Views: 839
    September 17th, 2019, 09:47 Go to last post
  16. Multiple consists of only 6's and 7's

    Started by Klaas van Aarsen, September 12th, 2019 06:01
    2 Pages
    1 2
    consists, end, instance, multiple, prove
    • Replies: 11
    • Views: 1,429
    September 16th, 2019, 05:45 Go to last post
  17. Multiple consists of only 1's

    Started by Klaas van Aarsen, September 11th, 2019 07:27
    consists, ends, instance, multiple, prove
    • Replies: 4
    • Views: 658
    September 12th, 2019, 10:23 Go to last post
  18. Trigonometric Sum Challenge

    Started by lfdahl, September 4th, 2019 16:41
    deduce, frac1n^2+n+1, left, sum_n=0^inftytan, trigonometric
    • Replies: 3
    • Views: 823
    September 8th, 2019, 05:46 Go to last post
  19. Volume of a solid

    Started by lfdahl, September 2nd, 2019 04:34
    $r$, leq, obtained, solid, volume
    • Replies: 2
    • Views: 527
    September 4th, 2019, 16:17 Go to last post
  20. Maximize the sum of squared distances

    Started by lfdahl, August 11th, 2019 17:19
    distances, maximize, points, squared, sum
    • Replies: 1
    • Views: 377
    August 20th, 2019, 13:54 Go to last post
  21. Probability challenge

    Started by lfdahl, August 3rd, 2019 15:06
    flipped, penny, probability, prove, times
    • Replies: 4
    • Views: 665
    August 15th, 2019, 16:54 Go to last post
  22. Find the possible values of k

    Started by lfdahl, August 2nd, 2019 04:35
    find, math, nordic, source, values
    • Replies: 2
    • Views: 553
    August 3rd, 2019, 14:55 Go to last post
  23. Determine all possible values

    Started by lfdahl, July 26th, 2019 04:38
    $d$, determine, positive, real, values
    • Replies: 2
    • Views: 562
    July 29th, 2019, 16:31 Go to last post
  24. Limit of integral challenge

    Started by lfdahl, July 22nd, 2019 18:17
    challenge, find, integral, limit, [lim_nrightarrow
    • Replies: 2
    • Views: 516
    July 25th, 2019, 16:24 Go to last post
  25. Static Analysis of Truss

    Started by littlemac, July 2nd, 2019 22:23
    • Replies: 0
    • Views: 353
    July 2nd, 2019, 22:23 Go to last post
  26. Electrical Engineering Problem

    Started by littlemac, July 2nd, 2019 21:10
    electrical, heater, line, power, thermal
    • Replies: 1
    • Views: 364
    July 2nd, 2019, 21:36 Go to last post
  27. Constractive dilemma

    Started by solakis, June 22nd, 2019 17:59
    constractive, dilemma, infer, law, propositional
    • Replies: 1
    • Views: 536
    June 28th, 2019, 11:13 Go to last post
  28. Unsolved Challenge
    Challenge Problem #7 [Olinguito]

    Started by Olinguito, May 20th, 2019 14:25
    challenge, geqslant, inequality, problem, unsolved
    • Replies: 2
    • Views: 718
    June 22nd, 2019, 16:51 Go to last post
  29. [SOLVED] Challenge Problem #9 [Olinguito]

    Started by Olinguito, June 13th, 2019 10:29
    $piin, challenge, group theory, permutation, s_n$
    • Replies: 4
    • Views: 842
    June 16th, 2019, 13:39 Go to last post
  30. Challenge Problem #8 [Olinguito]

    Started by Olinguito, May 25th, 2019 01:43
    challenge, numbers, problem, real, [olinguito]
    • Replies: 3
    • Views: 694
    June 14th, 2019, 08:11 Go to last post
  31. Challenge. Difficulty level - medium

    Started by ranga519, June 13th, 2019 12:37
    area, base, height, pyramid, side
    • Replies: 0
    • Views: 375
    June 13th, 2019, 12:37 Go to last post

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Top 96 Thread Starters For "Challenge Questions and Puzzles"

RankUser NamePercentage Of TotalThreadsMost Recent Thread
1anemone40.8755Inequality involves radical, s...
2Albert19.3358find a,b
3lfdahl8.4156Trigonometric Sum Challenge
4kaliprasad3.361irrational number
5ZaidAlyafey2.139Harmonic numbers identity
6jacks1.935value of k in definite Integra...
7MarkFL1.731Definite Integral
8Random Variable1.528A residue calculation
9sbhatnagar1.426Two Challenging Integrals
10solakis1.324axiomatics
10DreamWeaver1.324An inverse tangential problem
11Wilmer0.917Weird puzzle
12caffeinemachine0.815MHB's First Polymath Project.
12Tony0.815Tanh Integral
13Pranav0.713Summation challenge #2
14Klaas van Aarsen0.611Multiple consists of only 6's ...
15Krizalid0.510Continuity of IVP
15checkittwice0.510Determine all solutions in pos...
16Greg0.59Trigonometric Sum
16magneto0.59Sequence Challenge
16Olinguito0.59Challenge Problem #9 [Olinguit...
17mathmaniac0.486n^3 + 3 is not a perfect 6th ...
17eddybob1230.48Increasing and Decreasing Numb...
18melese0.47Rational roots
18Rido120.47Find the limit (n!)^(1/n)/n
18hxthanh0.47Write n = a + b + c + ...
18mente oscura0.47Find the 6 reals roots
19CaptainBlack0.36Problem from Paper 3 of the 19...
19Bacterius0.36Divergence of a trigonometric ...
19soroban0.36The Missing intercept
19mathbalarka0.36A double sum challenge
19mathworker0.36pigeon hole proof
19Shobhit0.36An Infinite product
19Fallen Angel0.36Find all functions
20Evgeny.Makarov0.35Cardinalities of finite sets
20Poirot0.35Co-prime challenge
20sadsadsadsa0.35Ricky's Dinner
20jacobi0.35Probability challenge
20Theia0.35Maximum Displacement in Projec...
21jakncoke0.24Putnam 2012: A5
21MountEvariste0.24Number theory problem #1
22Also sprach Zarathustra0.23Integral of x^{-x}
22alane19940.23Einstein's Riddle
22Farmtalk0.23Secret Order
22The Lord0.23Integral
22Petrus0.23Differential Equation challeng...
22castor280.23Weird function challenge
23chisigma0.12A false approach to an integra...
23TheBigBadBen0.12Logic problem
23M R0.12Geometry Challenge
23Fermat0.12integration
23Euge0.12Abstract Algebra Challenge
23maxkor0.12Find the ACB angle
23Illmatic0.12Sum of reciprocals of roots
23mrtwhs0.12Thumbtacks
23jmprada0.12Sphere diameter
23littlemac0.12Static Analysis of Truss
24The Chaz0.11Travelers and coins
24Prove It0.11Challenge: Is cos(pi/60) trans...
24Alexmahone0.11Hourglasses
24tkhunny0.11Missing in NY/PA
24Sherlock0.11Sum involving pi, ln(2) and Ca...
24Fernando Revilla0.11lim x ⌊1 / x⌋ , x...
24HallsofIvy0.11A geometric puzzle
24masters0.11Where's the father?
24DrunkenOldFool0.11infinite sum
24Opalg0.11Puzzle with digits
24Deveno0.11Identify the mystery group
24Amer0.11Nice Puzzle
24princeps0.11LCM Inequality
24Chris110.11Simple, fun puzzle
24QuestForInsight0.11Exponential limit
24topsquark0.11Sort of a challenge
24Petek0.11Unique Factorization Domains
24mssrki0.11Mathematics - a new basis
24johng0.11number of p subgroups
24judytl30.11Factoring over the Integers
24stainburg0.11Boring. Then Prove it!
24jeffer vitola0.11Limit is Sum
24individ0.11Solve triple square Diophantin...
24RLBrown0.11Next integer in this sequence,...
24Bibubo0.11divisibility and sums
24Dai0.11Puzzle
24Prakhar0.11Challenging Integral
24RobJob0.11The connected Game
24Monoxdifly0.11Arrange Mathematical Operation...
24Joppy0.11Show that is the square of an ...
24bio0.11Year 7 & 8 mathematics puz...
24rick1230.11The Durango Curve Problem
24TheFallen0180.11Mathematical puzzle involving ...
24ranga5190.11Challenge. Difficulty level - ...
24fb33420.11Tricky Question (for which I d...
24Tompson Lee0.11Tricky Logic Puzzle with 26 Va...
24LightningGirl0.11EASY Mathmatical Puzzle
24Dhamnekar Winod0.11Can we apply here logic?
24Satya0.11Quadrilateral Divider
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