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If the quadrilateral formed by the lines ax+bc+c=0. a'x+b'y+c=0, ax+by+c'=0, a'x+b'y+c'=0 has perpendicular diagonal, then

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The correct Answer is:
we have `|{:(a-a',b-b',c-c'),(A,B,C),(A',B',C'):}|=0`
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