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Editor
 Sep 18, 2022
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$ax^{2}+2hxy+by^{2}+2gx+2fy+c=0$ represents a pair of straight lines if
Difficulty: Easy
A: 
$a+b=0$
B: 
$ab=0$
C: 
$h^{2}-ab=0$
D: 
All of these
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NETNUST Entry TestMathematicsIntroduction to Analytical Geometry