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GMATPrep Practice Test 1

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niketdoshi123 Really wants to Beat The GMAT!
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GMATPrep Practice Test 1 Post Fri Apr 13, 2012 11:22 pm
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  • Lap #[LAPCOUNT] ([LAPTIME])
    If x>y^2>z^4
    Then which of the following can be True
    1)x>y>z
    2)z>y>x
    3)x>z>y

    a)only I
    b)both I & II
    c)both I & III
    d)only III
    e)all I, II & III

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    sam2304 GMAT Titan
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    Post Sat Apr 14, 2012 12:09 am
    Best way is to plug in numbers

    1. x > y > z => x = 10, y = 2, z = 1
    x > y^2 > z^4 => 10 > 4 > 1
    True

    2. z > y > x => x = 1/10, y = 1/5, z = 1/3
    x > y^2 > z^4 => 1/10 > 1/25 > 1/81
    True

    3. x > z > y => x = 100, z = 1/3, y = 1/5
    x > y^2 > z^4 = 100 > 1/25 > 1/81
    True

    Basically we need to check fractions and -ve values whenever sign is not given. 1 and 2 can be easily proved. 1 is true for all positive integers and 2 is the reversal which applies for all fractions in this case and negative nos won't come in this as we have even powers. 3rd case we have to check it independently.

    IMO E.

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    killer1387 GMAT Destroyer! Default Avatar
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    Post Sat Apr 14, 2012 12:31 am
    WITH E

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