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Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
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by palvarez » Wed Nov 25, 2009 1:37 pm
Rephrase it


Is a^2 - b^2 > 0

or (a+b)(a-b) > 0

1. a+b < 0, insufficient, since we need to know if a - b > 0
2. a < 0, insufficient.

Both insufficient, since we can't say b < 0. However, if (1) would have been b < a, the answer wud be C.
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by Abdulla » Wed Nov 25, 2009 2:29 pm
palvarez wrote:Rephrase it


Is a^2 - b^2 > 0

or (a+b)(a-b) > 0

1. a+b < 0, insufficient, since we need to know if a - b > 0
2. a < 0, insufficient.

Both insufficient, since we can't say b < 0. However, if (1) would have been b < a, the answer wud be C.
Great and easy approach palvarez !!

Thanks
Abdulla
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by brick2009 » Wed Nov 25, 2009 6:45 pm
hi abdulla.. u post the OA as A and say palvarez is right.. with his ans as C?

what is the OA?


rephrase: |a|-|b| <0

a.) b < -a --- insuff

b.) a<0 -infus


only value possible for a = -ve

..by substituting.. ans should be E and not C
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by Abdulla » Wed Nov 25, 2009 8:38 pm
brick2009 wrote:hi abdulla.. u post the OA as A and say palvarez is right.. with his ans as C?

what is the OA?


rephrase: |a|-|b| <0

a.) b < -a --- insuff

b.) a<0 -infus


only value possible for a = -ve

..by substituting.. ans should be E and not C
You should take a break buddy :lol: Check my answer again ... and read the last sentence in palvarez's post again...

Both insufficient, since we can't say b < 0. However, if (1) would have been b < a, the answer wud be C.
Abdulla
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