Math Chapter Wise Conic Section English MCQ UP PCS (Pre) 2001 Q.If circles x2 +y2 +2px+r = 0 and x2 +y2 +2qy+r = 0 touch each other then: A1 1 1 p q r − = B2 2 2 1 1 1 p q r + = C2 2 2 p q r + = D2 2 1 1 1 r p q + = Show answer Correct answer: 2 2 1 1 1 r p q + =