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# The Earth s rivers constantly carry dissolved salts into its

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05 Oct 2010, 09:02
Got it right.Good One thanks.
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05 Oct 2010, 09:09
ankitranjan wrote:
Got it right.Good One thanks.

u can add value to this forum by explaining.This forum is for give as well as take.
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05 Oct 2010, 09:11
A
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05 Oct 2010, 21:30
C and D are out .
From A, B and E
I chose E.
For A-it is not about large quantities or small quantities.
For B-We are concerned about the total salt content of all rivers to be same not independent rivers.
For E-it is a perfect answer.
Furthermore if you negate E.conclusion weakens that we may not get the true age.

Please let me know if i am correct
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14 Oct 2010, 09:25
E
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15 Oct 2010, 04:25
I chose E. CRs are killing me
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07 Oct 2011, 04:35
A) The quantities of dissolved salts deposited by rivers in the Earth’s oceans have not been unusually large during the past hundred years.
(E) None of the salts carried into the Earth’s oceans by rivers are used up by biological activity in the oceans.

Between A and E.
1. Averages get skewed if there is unusual variations. The argument assumes there are NONE.
2. Try and negate this --> NOT ALL of the salts carried into the Earth's oceans by rivers are used by biological activity in the oceans. Now it becomes clear that this sentence is harmless to the argument.

The problem here lies in the negation process. We have to be careful not to go for POLAR opposites during negation. If we go for POLAR opposites the answer becomes " ALL of the salts carried into the Earth’s oceans by rivers are used up by biological activity in the oceans."
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07 Oct 2011, 06:59
Nice question. Narrowed it down to A and E. But chose E, without further thoughts. Got it wrong

A) The quantities of dissolved salts deposited by rivers in the Earth’s oceans have not been unusually large during the past hundred years.
(E) None of the salts carried into the Earth’s oceans by rivers are used up by biological activity in the oceans.

Loved the explanation that we can account the factor of consumption of salt but not for unusually large amount of deposits of salt for which we have no data.
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
MGMAT 6 650 (51,31) on 31/8/11
MGMAT 1 670 (48,33) on 04/9/11
MGMAT 2 670 (47,34) on 07/9/11
MGMAT 3 680 (47,35) on 18/9/11
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CR notes
http://gmatclub.com/forum/massive-collection-of-verbal-questions-sc-rc-and-cr-106195.html#p832142
http://gmatclub.com/forum/1001-ds-questions-file-106193.html#p832133
http://gmatclub.com/forum/gmat-prep-critical-reasoning-collection-106783.html
http://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html
http://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html?hilit=chineseburned

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07 Oct 2011, 14:38
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09 Oct 2011, 18:47
i am also with E
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12 Oct 2011, 05:54
IMO A.
It was clearly between A and E.

Here is what I thought:

The key word here is "increase". The questions clearly says that the age can be calculated based on the "increase" in salt level. Hence, as long as the salt lost due to biological activity is constant, it does not make any difference to the process defined.
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12 Oct 2011, 07:25
thanks for this!
durgesh79 wrote:
between A and E...
one of the best ways for CR assumption questions
negate the assumption and the argument should fall apart.

negate E
Some of the salts carried into the Earth’s oceans by rivers are used up by biological activity in the oceans.
OK.. but if the portion of salt consumed by biological activities has remained constant over the years ... we can still predict the age of the oceans ... the argument doesnt fall apart

negate A
The quantities of dissolved salts deposited by rivers in the Earth’s oceans have been unusually large during the past hundred years.
it means that the rate has not been constant .... we cant predict the age .... agrument falls apart ...

right Option A

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12 Oct 2011, 16:58
A
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21 Oct 2011, 12:25
+1 A
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01 Nov 2011, 22:40
+1 A
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Re: The Earth s rivers constantly carry dissolved salts into its [#permalink]

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16 Nov 2011, 22:28
Between E and A but E fails the negation test so A it is.
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Re: The Earth s rivers constantly carry dissolved salts into its [#permalink]

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16 Nov 2011, 23:59
Still not satisfied with A,

can anyone clearly explain why not E and why A?

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Re: The Earth s rivers constantly carry dissolved salts into its [#permalink]

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17 Nov 2011, 00:29
A tricky one to choose between A and E ! I agree with the explanation of A . But could someone explain a bit more why E is not that much convincing like A?

Thanks
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Re: The Earth s rivers constantly carry dissolved salts into its [#permalink]

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17 Nov 2011, 02:02
Got it wrong. Opted for B
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Re: The Earth s rivers constantly carry dissolved salts into its [#permalink]

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21 Nov 2011, 01:18
imo A
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Re: The Earth s rivers constantly carry dissolved salts into its   [#permalink] 21 Nov 2011, 01:18

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