If the equation \[a{{x}^{2}}+b{{y}^{2}}+cx+cy=0\] represents a pair of straight lines, then

If the equation \[a{{x}^{2}}+b{{y}^{2}}+cx+cy=0\] represents a pair of

1.	If the equation \[a{{x}^{2}}+b{{y}^{2}}+cx+cy=0\] represents a pair of straight lines, then
A.	\[a(b+c)=0\]
B.	\[b(c+a)=0\]
C.	\[c(a+b)=0\]
D.	\[a+b+c=0\]
Answer» D. \[a+b+c=0\]

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If the equation \[a{{x}^{2}}+b{{y}^{2}}+cx+cy=0\] represents a pair of straight lines, then

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