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# Is X + Y Negative? i) X is Positive. ii) Y is Negative. It's

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Intern
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Is X + Y Negative? i) X is Positive. ii) Y is Negative. It's [#permalink]

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15 May 2011, 06:42
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50% (01:12) correct 50% (00:12) wrong based on 13 sessions

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Is X + Y Negative?

i) X is Positive.
ii) Y is Negative.

It's just a easy question, and I got wrong. (My Bad!)
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Re: Algebra - Data Sufficiency. [#permalink]

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15 May 2011, 06:52
hitmoss wrote:
Is X + Y Negative?

i) X is Positive.
ii) Y is Negative.

It's just a easy question, and I got wrong. (My Bad!)

1) and 2) clearly insufficient.
1)+2) still ins.
Consider,
$$x=10, y=-3, -> x+y=7>0$$
$$x=10, y=-35, -> x+y=-25<0$$

(E)
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Re: Algebra - Data Sufficiency. [#permalink]

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18 May 2011, 11:54
And is E ....
Is this level 500 Q?
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Re: Algebra - Data Sufficiency. [#permalink]

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18 May 2011, 21:57
no relative information between X and Y.
E
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Re: Algebra - Data Sufficiency. [#permalink]

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19 May 2011, 05:24
X = 1, Y = +2

X = 2 Y = -1

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Re: Algebra - Data Sufficiency. [#permalink]

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19 May 2011, 13:06
x+y<0 if both x & Y are - or x is - and y is + with |x|>|y| or x is + and y is - with |y| > |x|.

Even with the combinaion, since we only know the sign not the magnitude, it is insuff.
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Re: Algebra - Data Sufficiency. [#permalink]

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19 May 2011, 15:47
1. Not sufficient

x>0
if y>0 then x+y is not less than 0
if y<0 x+y may or may not be less than 0

2. Not sufficient

y<0
if x<0 then x+y<0
if x>0 x+y may or may not be less than 0

together
x>0 y<0

x y
1 -1 => x+y is not less than 0

1 -2 =>x+y <0

Hence not sufficient.

Re: Algebra - Data Sufficiency.   [#permalink] 19 May 2011, 15:47
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