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M1 q19 error?

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Intern
Joined: 09 Nov 2009
Posts: 20
Followers: 1

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M1 q19 error? [#permalink]  15 Nov 2009, 09:30
I think this is an error. If we plug in x < 1 and x >1 we get to different results if y =1. Stem does not state M is an interger. Am I off?
CIO
Joined: 02 Oct 2007
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Re: M1 q19 error? [#permalink]  16 Nov 2009, 00:12
I'm sorry, I don't follow how you arrived to this conclusion. Where did you plug the values of $$X$$ in?
If we take S1, we get this:
$$\sqrt{X} \gt \sqrt{Y}$$
or
$$X \gt Y$$
after we square both sides. Why would you plug in $$X \lt 1$$ and $$Y =1$$ in there if it says that $$X \gt Y$$? S1 is sufficient to answer the question.
Let's see what we have with S2:
$$X^2 \gt Y^2$$
I see no reason to plug $$X \lt 1$$ and $$Y=1$$ in here... S2 is not sufficient since plugging in X=4, Y=2 and X=-4, Y=2 produce different results while not violating S2.

I hope this helps.

ajonas wrote:
I think this is an error. If we plug in x < 1 and x >1 we get to different results if y =1. Stem does not state M is an interger. Am I off?

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Re: M1 q19 error?   [#permalink] 16 Nov 2009, 00:12
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M1 q19 error?

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