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Wednesday, September 22, 2010
If xy = - 6, what is the value of xy ( x + y )?
(1) x - y = 5
(2) xy^2= 18
From 1)
x^2 - xy = 5x
x^2 -5x +6 = 0
(x-3)(x-2) = 0
Insuff
From 2)
y * -6 = 18
y = -3 & x = 2
Suff
Ans - B
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