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if x and y are +ve nos. is x>y? 1) x+y<1 2) y>x^2/2

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if x and y are +ve nos. is x>y? 1) x+y<1 2) y>x^2/2 [#permalink]

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New post 06 Sep 2008, 21:11
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C
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E

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if x and y are +ve nos. is x>y?
1) x+y<1
2) y>x^2/2.

Kudos [?]: 222 [0], given: 0

1 KUDOS received
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Joined: 07 Nov 2007
Posts: 1792

Kudos [?]: 1058 [1], given: 5

Location: New York
Re: DS x and y [#permalink]

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New post 06 Sep 2008, 22:12
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arjtryarjtry wrote:
if x and y are +ve nos. is x>y?
1) x+y<1
2) y>x^2/2.


1)
x=1/4 and y=1/2
or
x=1/2 and y=1/4
not sufficient
2)2y>x^2
x=1/2 y=1/4 (x>y) satisfies the above equation
x=1/8 y=1/4 (x<y) satisfies the above equation.
not suffcient
combined

same as 2
not suffcient

E
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Kudos [?]: 1058 [1], given: 5

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Joined: 03 Jun 2008
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Re: DS x and y [#permalink]

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New post 07 Sep 2008, 00:12
x2suresh wrote:
arjtryarjtry wrote:
if x and y are +ve nos. is x>y?
1) x+y<1
2) y>x^2/2.


1)
x=1/4 and y=1/2
or
x=1/2 and y=1/4
not sufficient
2)2y>x^2
x=1/2 y=1/4 (x>y) satisfies the above equation
x=1/8 y=1/4 (x<y) satisfies the above equation.
not suffcient
combined

same as 2
not suffcient

E


I concur.
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Re: DS x and y [#permalink]

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New post 07 Sep 2008, 21:37
GMBA85 wrote:
x2suresh wrote:
arjtryarjtry wrote:
if x and y are +ve nos. is x>y?
1) x+y<1
2) y>x^2/2.


1)
x=1/4 and y=1/2
or
x=1/2 and y=1/4
not sufficient
2)2y>x^2
x=1/2 y=1/4 (x>y) satisfies the above equation
x=1/8 y=1/4 (x<y) satisfies the above equation.
not suffcient
combined

same as 2
not suffcient

E


I concur.


I believe the correct answer is C...

Here is Why. This is an YES or NO question basically.
The questions asks which of these following statements will answer no to the question.
is x>y

so x and y are any +ve #'s so lets say we choose x= 1000 and y=2
both of the answer will come up NO. the Same thing that the question is asking for. is X>Y the answer is NO... so its C

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Joined: 17 Jun 2008
Posts: 1535

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Re: DS x and y [#permalink]

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New post 07 Sep 2008, 23:07
Quote:
I believe the correct answer is C...

Here is Why. This is an YES or NO question basically.
The questions asks which of these following statements will answer no to the question.
is x>y

so x and y are any +ve #'s so lets say we choose x= 1000 and y=2
both of the answer will come up NO. the Same thing that the question is asking for. is X>Y the answer is NO... so its C



With this logic, if you take stmt 1, it says x + y < 1. Now, if x is 1/2 and y is 1/3 then x > y. But, if x = 1/3 and y = 1/2, then x < y. Thus, stmt 1 is insufficient.

Similarly, for stmt 2, if x = 1/2 and y = 1/3 then y > (x^2)/2 . The same is true for x = 1/3 and y = 1/2. Hence, insufficient.

Combining the two also will give the same result. Hence, E.

Kudos [?]: 279 [0], given: 0

Re: DS x and y   [#permalink] 07 Sep 2008, 23:07
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