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Princeton CAT2 - DS Inequality

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Source: — Data Sufficiency |
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by david2008 » Fri Jun 12, 2009 3:08 pm
So think there is a typo in the question stem; i presume the equation given is x+y^2+3z>=0 is that right?

in that case, i agree it should be E

It is easy to come up with examples why B isn't sufficient and why C wouldn't be the right answer either
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by tyler_durden » Fri Jun 12, 2009 8:48 pm
x + y^2 + 3z >= 0;

1. y> = 0; doesn't help

y^2 is anyways going to be > =0; 1 is insufficient

2. x<=0; z<=0

in first place itself the inequality can be written as is x + 3z > = 0? (y^2 is going to be > = 0)

again this is not sufficient;

even the combination of 1 and 2 doesn;t help.

IMO E
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