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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 `p=5` (b) `p=-5` `q=-1` (d) `q=1`

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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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