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Doubt in Chapter 8 (The Number Properties Guide Prep )

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subhadeep2011
 Post subject: Doubt in Chapter 8 (The Number Properties Guide Prep )
 Post Posted: Thu Feb 24, 2011 11:36 am 
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Hi ,

I was going through the Basic of Data Sufficiency Chapter ( Chap 8 ) in "The Number Properties Guide" , and had a doubt regarding one of the rules mentioend there.

In the part "The Statements Never Contradict each other" ( Page 96) , the example states that the value of 'n' should be equal in each of the 2 statements.

However , I thought that each statement for DS should be taken individually ( they do not have any dependencies ) unless we are looking for option (C) - where both statements combined are sufficient.

Can somebody please explain this rule to me ?
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RonPurewal
 Post subject: Re: Doubt in Chapter 8 (The Number Properties Guide Prep )
 Post Posted: Fri Feb 25, 2011 6:14 am 
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yes, you should take the two statements individually at first -- but that has nothing to do with the statement given here, which is a statement about the restrictions on DS problems overall.

the most accurate way to summarize this truth is the following:
on any DS problem, the two statements MUST HAVE AT LEAST ONE SOLUTION IN COMMON.
i.e., statement (1) and statement (2) are not allowed to be mutually exclusive.

note that you can use this fact to your advantage even if you don't get to the point of putting the statements together. here's how:
if you get mutually exclusive results from the two numbered statements, then your work for at least one of those statements is wrong.

this DOESN'T mean that you should be combining the statements at the outset of the problem -- but it does give you a helpful criterion in judging whether you've done the correct work.
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subhadeep2011
 Post subject: Re: Doubt in Chapter 8 (The Number Properties Guide Prep )
 Post Posted: Sun Feb 27, 2011 9:46 am 
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Thanks for the clarification. Makes much more sense now.
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jnelson0612
 Post subject: Re: Doubt in Chapter 8 (The Number Properties Guide Prep )
 Post Posted: Sun Feb 27, 2011 7:30 pm 
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Great, thanks.

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Jamie Nelson
ManhattanGMAT Instructor
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