pair-st-lines

Question: If the equation $a{{x}^{2}}+b{{y}^{2}}+cx+cy=0$ represents a pair of straight lines, then



1) $a(b+c)=0$
2) $b(c+a)=0$
3) $c(a+b)=0$
4) $a+b+c=0$
Solution: Explanation: No Explanation
Equation of pair of straight lines

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