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Thread: Hard one

  1. #1
    Within my grasp! Stormgal 's dreams are becoming reality. Stormgal's Avatar
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    Exclamation Hard one

    In the infinite sequence A, ,
    where x is a positive integer constant. For what value of n is the ratio
    of to equal to ?

    (A) 8
    (B) 7
    (C) 6
    (D) 5
    (E) 4

    source: mgmat

  2. #2
    The Power Within mba05 just joined TestMagic.
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    Re: Hard one

    is it B ? n = 7
    ------------------------------
    In the middle of difficulty, lies opportunity - Albert Einstein

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    Re: Hard one

    I wud go for B too... whats the answer..!

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    Trying to make mom and pop proud Seriph has disabled reputation
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    Re: Hard one

    I get answer of 7, or B, too. How would you approach this problem in general other than plugging in the answers after expanding the denominator?

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    Within my grasp! Sargataur 's dreams are becoming reality. Sargataur's Avatar
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    Re: Hard one

    any more thoughts on this one
    a month to first tame the beast, then lay it down; rip out its legs;then its horns;smash its skull;finally when it's totally helpless, gouge its eyes out and pull out a 750 plus - I'm BLOODTHIRSTY AS HELL

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    Re: Hard one

    The method I followed was to reduce the Q to (x^6/ x ) * ( Y/Y)
    the eqn An= (x ^ n -1)(1+ x + x^2 + x^3 +.... ) ----------------------------(1)

    and the eqn x(1+x(1+x(1+x...))))
    which i call Z can be reduced to x( 1+x+x^2+x^3 ..) --------(2)

    from (1) and (2) we get An / Z = x^(n-1) / x
    therefore for getting answer x^5 (n-1) = 6
    therefore n=7

    Ans: B
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    Re: Hard one

    Its B.

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    Trying to make mom and pop proud vinesh just joined TestMagic. vinesh's Avatar
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    Re: Hard one

    b for me too

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    Within my grasp! Stormgal 's dreams are becoming reality. Stormgal's Avatar
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    Re: Hard one

    Quote Originally Posted by Sargataur
    any more thoughts on this one
    Sargataur, is this the type of question one would encounter on the GMAT?

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    Within my grasp! ashok_sharma just joined TestMagic.
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    Re: Hard one

    [QUOTE=Stormgal]In the infinite sequence A, ,
    where x is a positive integer constant. For what value of n is the ratio
    of to equal to ?

    (A) 8
    (B) 7
    (C) 6
    (D) 5
    (E) 4

    the answer is B

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