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mayankdevnani Group Title

Solve this ONE :- Q-) Problem on SERIES. 6,20,36,48,50,?,0 a)36 b)40 c)46 d)56 Which number comes in place of "?" ?

  • 8 months ago
  • 8 months ago

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  1. mayankdevnani Group Title
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    @ash2326 @phi @UsukiDoll

    • 8 months ago
  2. INeedHelpPlease? Group Title
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    56?

    • 8 months ago
  3. mayankdevnani Group Title
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    how?

    • 8 months ago
  4. UsukiDoll Group Title
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    Ned Flanders

    • 8 months ago
  5. mayankdevnani Group Title
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    what?

    • 8 months ago
  6. mayankdevnani Group Title
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    @INeedHelpPlease? help me

    • 8 months ago
  7. RadEn Group Title
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    Tn = 7n^2 - n^3 T1 = 7(1)^2 - (1)^3 = 6 T2 = 7(2)^2 - (2)^3 = 20 .... ... T6 = 7(6)^2 - (6)^3 = 78 T7 = 7(7)^2 - (7)^3 = 0 so, it is T6 = 78

    • 8 months ago
  8. mayankdevnani Group Title
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    but it is not in options. @RadEn

    • 8 months ago
  9. mayankdevnani Group Title
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    i know this is also a answer but i need answer which is in options?

    • 8 months ago
  10. mayankdevnani Group Title
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    @hartnn can you help me ?

    • 8 months ago
  11. hartnn Group Title
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    how did u get Tn RadEn ?

    • 8 months ago
  12. SithsAndGiggles Group Title
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    @RadEn's reasoning checks out, his answer should be 36 though. \(7(6^2)-6^3=252-216=36\)

    • 8 months ago
  13. mayankdevnani Group Title
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    he makes the series to solve it. @hartnn

    • 8 months ago
  14. hartnn Group Title
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    yeah, i know how to find Tn, but i wanted to know whether RadEn used any different/simpler method....

    • 8 months ago
  15. mayankdevnani Group Title
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    his method is wrong.

    • 8 months ago
  16. hartnn Group Title
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    he got the answer which is in the choices, how u say its wrong ?

    • 8 months ago
  17. mayankdevnani Group Title
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    because if we put n=6,the answer comes to be is 36 but in actual(followed by series)the answer would be 50

    • 8 months ago
  18. mayankdevnani Group Title
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    isiliye mujhe lagta h ki voh galat h

    • 8 months ago
  19. hartnn Group Title
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    " in actual(followed by series)the answer would be 50" what does this even mean ?

    • 8 months ago
  20. mayankdevnani Group Title
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    iska matla agar hum uske tarike se follow karien to iska answer 50 aana chaihye series ke hisaab se lekin actual main 36 aa raha h..... iska method thode se hi digits ke liye apply hota h

    • 8 months ago
  21. mayankdevnani Group Title
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    now understood @hartnn bhaiya

    • 8 months ago
  22. hartnn Group Title
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    lol, i could translate that in hindi myself too

    • 8 months ago
  23. hartnn Group Title
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    why u say answer should be 50 ?

    • 8 months ago
  24. mayankdevnani Group Title
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    bhaiya , yeh question ntse 2013 RAJ. main poocha gaya tha aur FIITJEE vaalein bata rahein h ki iska answer DATA INADEQUATE h aur CAREER POINT vallein bata rahein h ki iska answer 36 h

    • 8 months ago
  25. mayankdevnani Group Title
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    to iska kya answer hoga bhaiya?

    • 8 months ago
  26. mayankdevnani Group Title
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    @hartnn

    • 8 months ago
  27. hartnn Group Title
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    the answer to this is indeed 36 as shown corretly by RadEn

    • 8 months ago
  28. mayankdevnani Group Title
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    okk...thank you,,, @hartnn and @RadEn

    • 8 months ago
  29. hartnn Group Title
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    i just wanted to know any simpler way of finding Tn :P

    • 8 months ago
  30. mayankdevnani Group Title
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    yeah...this logic doesn't apply in NTSE STAGE 1

    • 8 months ago
  31. mayankdevnani Group Title
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    i think there is another logic simpler logic for this

    • 8 months ago
  32. hartnn Group Title
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    i think it does apply, the third differences are constant

    • 8 months ago
  33. hartnn Group Title
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    |dw:1385197162928:dw|

    • 8 months ago
  34. hartnn Group Title
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    so, x - 52 - (-10) = -6

    • 8 months ago
  35. hartnn Group Title
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    x= 42 - 6 = 36

    • 8 months ago
  36. hartnn Group Title
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    @mayankdevnani @RadEn any simpler way to find Tn ?

    • 8 months ago
  37. RadEn Group Title
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    wolfram is simpler way , @hartnn hehehe :) why i cant see notification in OS ??

    • 8 months ago
  38. RadEn Group Title
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    http://www.wolframalpha.com/input/?i=6%2C20%2C36%2C48%2C50

    • 8 months ago
  39. hartnn Group Title
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    oh lol but i guess they can't use wolf.... so using the 3rd difference is a simpler manual way...

    • 8 months ago
  40. RadEn Group Title
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    yeah, just input some numbers in wolfram :)

    • 8 months ago
  41. hartnn Group Title
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    and nobody can see notifications its the bug OS admins are trying to fix

    • 8 months ago
  42. RadEn Group Title
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    ohhhh, thanks

    • 8 months ago
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