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If the equation 2x^2-3xy-py^2 +x+qy-1=0\...

If the equation `2x^2-3xy-py^2 +x+qy-1=0\ (p, q in I)` represents two mutually perpendicular lines, then (A) `p^2+q^2=13` (B) `p-q=5` (C) `p^2-q^2=1` (D) `p+q=5`

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