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If the lines a1x+b1y+1=0,a2x+b2y+1=0 and...

If the lines `a_1x+b_1y+1=0,a_2x+b_2y+1=0 and a_3x+b_3y+1=0` are concurrent, show that the point `(a_1, b_1),(a_1, b_2) and (a_3, b_3)` are collinear.

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