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28 Mar 2016, 02:29
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E
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91% (00:53) correct
9%
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based on 116
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bethebest
Joined: 01 Mar 2014
Last visit: 24 Mar 2017
Posts: 97
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Given Kudos: 616
Schools: Tepper '18
28 Mar 2016, 03:37
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Bunuel
Is xy > 0?
(1) x^2 > 0
(2) xy^2 > 0
(1) x^2 > 0
(2) xy^2 > 0
xy>0 means either x and y both are positive, or x and y both are negative.
Statement 1) x^2 >0, x could be positive or negative. Also nothing given about y. - not sufficient
Statement 2) xy^2 > 0 => x>0 and y^2 >0, Y could be positive or negative. not sufficient.
Both statements put together do not say anything about y. Therefore both statements are not sufficient to answer this.
Answer E
Please suggest if this is correct.
28 Mar 2016, 03:39
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Is xy > 0?
=> x > 0 and y > 0 or x<0 and y<0
(1) x^2 > 0
Not sufficient
Square of any number will be > 0
(2) xy^2 > 0
=> x> 0 since y^2 >0
But we have can not infer whether y is positive or negative
Not sufficient
Combining 1 and 2 ,
Not sufficient
Answer E
=> x > 0 and y > 0 or x<0 and y<0
(1) x^2 > 0
Not sufficient
Square of any number will be > 0
(2) xy^2 > 0
=> x> 0 since y^2 >0
But we have can not infer whether y is positive or negative
Not sufficient
Combining 1 and 2 ,
Not sufficient
Answer E
