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by mike34 » Thu Jan 06, 2011 12:45 am
X is negative

Y is negative

then XY>0

Answer : A
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by Night reader » Thu Jan 06, 2011 12:48 am
mike34 wrote:X is negative

Y is negative

then XY>0

Answer : A
@mike34: thanks, you are absolutely correct!
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by Anurag@Gurome » Thu Jan 06, 2011 1:40 am
Night reader wrote:If |x|>x and y*|z|<0. which of the following statements is true

A. xy>0
B. x+z<0
C. y<1
D. y>0
E. z>0
1. |x| > x implies x < 0
2. y*|z| < 0 implies y < 0 and z ≠ 0. This is because |z| is non-negative. Thus y*|z| is negative only if y is negative.

Hence, the product of x and y is always positive.

The correct answer is A.
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