Math Chapter Wise Conic Section English MCQ UP PCS (Pre) 1998 Q.The two circles x2 + y2 + 2ax + c = 0, x2 + y2 + 2bx + c = 0 will touch if: A2 2 2 1 1 1 a b c + = B2 2 2 1 1 1 a b c − = C2 2 1 1 1 c a b + = D2 2 1 1 1 c a b − = Show answer Correct answer: 2 2 1 1 1 c a b + =