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If x > y^2 > Z ^4, which of the following statements

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Joined: 24 Mar 2011
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Location: Texas
If x > y^2 > Z ^4, which of the following statements [#permalink]

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23 Apr 2011, 15:40
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35% (medium)

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67% (02:30) correct 33% (00:49) wrong based on 21 sessions

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If x > y^2 > Z ^4, which of the following statements could be true?

I) x > y > Z
II) z > y > x
III) x > z > y

1) I only
2) I & II only
3) I & III only
4) II & III only
5) I, II & III
[Reveal] Spoiler: OA
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Joined: 20 Dec 2010
Posts: 2010

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24 Apr 2011, 11:42
agdimple333 wrote:
If x > y^2 > Z ^4, which of the following statements could be true?

I) x > y > Z
II) z > y > x
III) x > z > y

1) I only
2) I & II only
3) I & III only
4) II & III only
5) I, II & III

We know between 0 and 1; the higher power of the number is less than lower power of the number.

0.1^4<0.1^2<0.1

Consider 3 numbers between 0 and 1, which are close to one another.
0.1,0.2,0.3

Assign the value as per the option and see whether the stem holds true.

I. x > y > Z
x=0.3
y=0.2; y^2=0.04
z=0.1; z^4=0.0001
x>y^2>z^4
TRUE.

II. z > y > x
z=0.3; z^4=.0081
y=0.2; y^2=0.04
x=0.1
x>y^2>z^4
TRUE.

III. x > z > y
x=0.3
z=0.2; z^4=.0016
y=0.1; y^2=0.01
x>y^2>z^4
TRUE.

Ans: "E"
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24 Apr 2011, 19:17
x = 6, y = 2, z = 1 => (I) is true

z = 1/5, y = 1/6, x = 1/7 => (II) is true

x = 3/4, y = 1/3, z = 1/2 => (III) is true

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19 May 2011, 23:26
ans is E, plug positive numbers and fractions and negative numbers and zero and check.
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19 May 2011, 23:33
x,y,z with values 1,2,3.
0.1,0.4 and 0.5.

gives E
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Re: Inequalities   [#permalink] 19 May 2011, 23:33
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