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The line L1-=4x+3y-12=0 intersects the ...

The line `L_1-=4x+3y-12=0` intersects the x-and y-axies at `A` and `B ,` respectively. A variable line perpendicular to `L_1` intersects the x- and the y-axis at `P` and `Q` , respectively. Then the locus of the circumcenter of triangle `A B Q` is (a) `3x-4y+2=0` (b) `4x+3y+7=0` (c) `6x-8y+7=0` (d) none of these

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