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is Y equal to 1

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Senior | Next Rank: 100 Posts
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by nhai2003 » Wed Jul 08, 2009 12:00 am
if X=1/2, is Y equal to 1?

(1) Y^2(x+1/5)=1
(2) Y(2x-1)=2x-Y

Sorry, my mistake
OA: D
Last edited by nhai2003 on Wed Jul 08, 2009 5:52 am, edited 2 times in total.
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Source: — Data Sufficiency |
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by kvamsy » Wed Jul 08, 2009 1:04 am
Statement 1:

1) Substitute X = 1/2 gives us Y = + SQRT(10/3) , - SQRT (10/3)

Which will tell us Y is not equal to 1 , Which is sufficient

2) Substitute X = 1/2 gives us Y = 1 ( exactly ) which is sufficient to answer

Hence D be the answer in my point of view, Please let me know how it got B as answer
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by aj5105 » Wed Jul 08, 2009 3:14 am
I marked (D).

Anybody?
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by shibal » Wed Jul 08, 2009 4:49 pm
kvamsy wrote:Statement 1:

1) Substitute X = 1/2 gives us Y = + SQRT(10/3) , - SQRT (10/3)
it gives us +(10/7)^2 and -(10/7)^2.... it's suff anyways...
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