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millen.paschich
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Post subject: Guide 1, 4th ed., pg 40  Posted: Thu Mar 03, 2011 1:45 am |
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data sufficiency and sign question:
is the product of all of the elements in Set S negative?
1) all of the elements in Set S are negative
2) there are 5 negative numbers in Set S
my issue: i understand that statement 1) does not tell us how many numbers are in Set S, so we can not determine the sign. however, statement 2) tells us both how many numbers (5) and those numbers sign (negative). given that I believe zero can not be negative, why is the answer C, combined?
thanks
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apwiedmann
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Post subject: Re: Guide 1, 4th ed., pg 40 Posted: Thu Mar 03, 2011 4:05 am |
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The second statement does not tell us how many numbers are in the set. There are definitely 5 negative numbers in the set but there may be a lot of other numbers in the set, too. One of these numbers could be 0, which means that the product of all the elements would be neither positive nor negative, since 0 is "neutral". As a result, you need both statements to know that a) there is no 0 in the set and b) there is an odd number of negative numbers in the set.
It's a mean question. Would you mind having a look at my question, which I posted just before yours? My question also refers to the first guide. Thanks!
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tim
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Post subject: Re: Guide 1, 4th ed., pg 40 Posted: Fri Mar 04, 2011 9:30 pm |
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| ManhattanGMAT Staff |
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Location: Southwest Airlines, seat 21C
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good explanation!
_________________
Tim Sanders
Manhattan GMAT Instructor
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Rnaut
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Post subject: Re: Guide 1, 4th ed., pg 40 Posted: Wed Nov 23, 2011 4:31 pm |
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I don't understand why is statement 2 " Insuffieceint " !
Statement 2 : There are 5 negative numbers in Set S
0 is neither negative nor positive. So, 0 should not be included in the Set S.
Considering that...product of all other ( non- zero) elements will result in a negative Set S.
Please explain where I went wrong. Thanks
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tim
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Post subject: Re: Guide 1, 4th ed., pg 40 Posted: Wed Dec 07, 2011 2:37 pm |
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| ManhattanGMAT Staff |
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Location: Southwest Airlines, seat 21C
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Where does it say 0 cannot be a member of the set?
_________________
Tim Sanders
Manhattan GMAT Instructor
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trapanister
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Post subject: Re: Guide 1, 4th ed., pg 40 Posted: Thu Dec 15, 2011 5:56 pm |
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to be honest the same guide says: if the GMAt says that "there are 5 of something" the are EXACTLY 5 of something......
So, if we have 5 of something and the statement tell us that there are 5 negative why we must infer that we can have more of 5 elements ??'
I'm not sure why we have to consider also 0 among the numbers of the set........
As a matter of fact, the same guide says HOWEVER, why however and bla bla bla .....
regards .
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tim
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Post subject: Re: Guide 1, 4th ed., pg 40 Posted: Sat Dec 31, 2011 1:47 pm |
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| ManhattanGMAT Staff |
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If the GMAT tells you there are 5 negative numbers, there are only 5 negative numbers. This does not preclude the possibility that there could be numbers that are 0 or positive..
_________________
Tim Sanders
Manhattan GMAT Instructor
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