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Manhattan GMAT Guide Question

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Manhattan GMAT Guide Question

by BlindVision » Tue Feb 24, 2009 5:49 pm
In the Number Properties guide book, under Data Sufficiency Strategy section it states that "The Statements Never Contradict Each Other" and it goes on to say... "Whenever you find that your statements contradict each other, it means that you've made a mistake!" and on the side note it further emphasizes that "The two data sufficiency statements always provide TRUE information: therefore, the statements cannot contradict each other."

I've re-read the page several times and the examples and I cannot get a clear idea of what it means when "statements never contradict each other" or "TRUE information". Can someone please elaborate in easy language so that I can understand? If you can provide clear examples I would appreciate it. Please help me get over this learning curve. Thank you!
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by cramya » Tue Feb 24, 2009 7:18 pm
Not a book example. Here it goes:

Here's the contradiction:

Stmt I

x is an integer

Stmt II

x is not an integer


Always in a DS the 2 statements would have something common between the variables or whatever is mentioned in the question.

Eg: Hypotheitcal

Stmt I

x is even

Stmt II

x =2

2 is even. They are related/intertwined in some way.


Stmt I

x is between 2 and 7

Stmt II

x is between 5 and 7


The 2 stmts had 5 to 7 common


Hope this helps!


Regards,
CR
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by BlindVision » Tue Feb 24, 2009 10:24 pm
Big Thanks, Cramya! I totally get it now! You have definitely saved me with future DS questions.
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by welcome » Wed Feb 25, 2009 3:06 pm
Good explanation cramya.

In addition to that we can see all DS question inwhich you get the answer D, always gives you same value. Eg. if you have to find a value of X, and if answerd is D, then both the values from given options will match.
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