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If one of the lines given by the equatio...

If one of the lines given by the equation `2x^2+p x y+3y^2=0` coincide with one of those given by `2x^2+q x y-3y^2=0` and the other lines represented by them are perpendicular, then (a)`p=5` (b) `p=-5` (c)`q=-1` (d) `q=1`

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