Math Chapter Wise Ordinary And Partial Differential Equations, Integral Equations And Calculus Of Variations English MCQ UP Higher Asst. Prof. 2021 Q.The principal radii at the origin of the surface 2z = 5x2 + 4xy + 2y2 is A1 1, 6 B1 3, 2 C1 2, 6 D1 1, 2 Show answer Correct answer: 1 1, 6