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I don't get it

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by feeet » Sun Apr 12, 2009 12:19 am
hi,

please explain the attached question. I do not get why it is C

From (1) we know that n>-1, so n could be negative or positive.
From (2) we know that n*p must be postive so both (p and n) must be positiv or both negative.

Since n can be both (1), I do not see why we taking (1) and (2) together is sufficient?!?!

Thanks
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Source: — Data Sufficiency |
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by vittalgmat » Sun Apr 12, 2009 12:41 am
stmt 1 says n > -1
stmt 2 says n and p Both are +ve or Both are -ve.

Combining 1 and 2 ,
from 1, n cannot be -ve coz n is an integer > -1.
could be 0, 1 .. etc

from 2, both n and p should be both +ve or both -ve
so n = 0 is ruled out . So both n and p are +ve. ie
n > 0 , p > 0
Sufficient.


ht helps
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I am so stupid

by feeet » Sun Apr 12, 2009 12:53 am
you know what I thought, n could be negative between 0 and -1, however, the question tells u that it is an integer!!!!!!!

I am so stupid!!!!!


thanks
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Re: I am so stupid

by vittalgmat » Sun Apr 12, 2009 12:58 am
feeet wrote:you know what I thought, n could be negative between 0 and -1, however, the question tells u that it is an integer!!!!!!!

I am so stupid!!!!!


thanks
Take it easy my friend!.

we all commit such blunders!!! As long as we dont do it on the real one, I dont care ;-)
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