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Re: Inequality - DS [#permalink]
16 Jun 2008, 14:15

I agree with alpha_plus_gamma – it’s C.

Quote:

With A, the eqn boils down to... r^2 + 2 > r^2 And, the above eqn holds true for all values of r (positive and negative)

While it seems at first that a) is sufficient, it is not so. We need second condition in order to transform the inequality to the form r^2+2 > r^2. without the condition r>0, the transformation would be invalid (since it implies the multiplication of the inequality by (possibly) negative number).

Re: Inequality - DS [#permalink]
17 Jun 2008, 11:00

OA is C.

used the same logic as alpha and greenoak.

thanks.

greenoak wrote:

I agree with alpha_plus_gamma – it’s C.

Quote:

With A, the eqn boils down to... r^2 + 2 > r^2 And, the above eqn holds true for all values of r (positive and negative)

While it seems at first that a) is sufficient, it is not so. We need second condition in order to transform the inequality to the form r^2+2 > r^2. without the condition r>0, the transformation would be invalid (since it implies the multiplication of the inequality by (possibly) negative number).

gmatclubot

Re: Inequality - DS
[#permalink]
17 Jun 2008, 11:00

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