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If the linesa1x+b1y+1=0,\ a2x+b2y+1=0\ a...

If the lines`a_1x+b_1y+1=0,\ a_2x+b_2y+1=0\ a n d\ a_3x+b_3y+1=0` are concurrent, show that the points `(a_1, b_1),\ (a_2, b_2)a n d\ (a_3, b_3)` are collinear.

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