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mayankdevnani

  • one year ago

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 "?" ?

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  1. mayankdevnani
    • one year ago
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    @ash2326 @phi @UsukiDoll

  2. INeedHelpPlease?
    • one year ago
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    56?

  3. mayankdevnani
    • one year ago
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    how?

  4. UsukiDoll
    • one year ago
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    Ned Flanders

  5. mayankdevnani
    • one year ago
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    what?

  6. mayankdevnani
    • one year ago
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    @INeedHelpPlease? help me

  7. RadEn
    • one year ago
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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. mayankdevnani
    • one year ago
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    but it is not in options. @RadEn

  9. mayankdevnani
    • one year ago
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    i know this is also a answer but i need answer which is in options?

  10. mayankdevnani
    • one year ago
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    @hartnn can you help me ?

  11. hartnn
    • one year ago
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    how did u get Tn RadEn ?

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

  13. mayankdevnani
    • one year ago
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    he makes the series to solve it. @hartnn

  14. hartnn
    • one year ago
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    yeah, i know how to find Tn, but i wanted to know whether RadEn used any different/simpler method....

  15. mayankdevnani
    • one year ago
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    his method is wrong.

  16. hartnn
    • one year ago
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    he got the answer which is in the choices, how u say its wrong ?

  17. mayankdevnani
    • one year ago
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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

  18. mayankdevnani
    • one year ago
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    isiliye mujhe lagta h ki voh galat h

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

  20. mayankdevnani
    • one year ago
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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

  21. mayankdevnani
    • one year ago
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    now understood @hartnn bhaiya

  22. hartnn
    • one year ago
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    lol, i could translate that in hindi myself too

  23. hartnn
    • one year ago
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    why u say answer should be 50 ?

  24. mayankdevnani
    • one year ago
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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

  25. mayankdevnani
    • one year ago
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    to iska kya answer hoga bhaiya?

  26. mayankdevnani
    • one year ago
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    @hartnn

  27. hartnn
    • one year ago
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    the answer to this is indeed 36 as shown corretly by RadEn

  28. mayankdevnani
    • one year ago
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    okk...thank you,,, @hartnn and @RadEn

  29. hartnn
    • one year ago
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    i just wanted to know any simpler way of finding Tn :P

  30. mayankdevnani
    • one year ago
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    yeah...this logic doesn't apply in NTSE STAGE 1

  31. mayankdevnani
    • one year ago
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    i think there is another logic simpler logic for this

  32. hartnn
    • one year ago
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    i think it does apply, the third differences are constant

  33. hartnn
    • one year ago
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    |dw:1385197162928:dw|

  34. hartnn
    • one year ago
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    so, x - 52 - (-10) = -6

  35. hartnn
    • one year ago
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    x= 42 - 6 = 36

  36. hartnn
    • one year ago
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    @mayankdevnani @RadEn any simpler way to find Tn ?

  37. RadEn
    • one year ago
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    wolfram is simpler way , @hartnn hehehe :) why i cant see notification in OS ??

  38. RadEn
    • one year ago
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    http://www.wolframalpha.com/input/?i=6%2C20%2C36%2C48%2C50

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

  40. RadEn
    • one year ago
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    yeah, just input some numbers in wolfram :)

  41. hartnn
    • one year ago
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    and nobody can see notifications its the bug OS admins are trying to fix

  42. RadEn
    • one year ago
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    ohhhh, thanks

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