CAT 2020 Slot 3 QA Q23 Equations

Question 23 of the Quantitative Ability (QA) section, CAT 2020 Slot 3, with CAT's official answer.

Let m and n be positive integers, If x2 + mx + 2n = 0 and x2 + 2nx + m = 0 have real roots, then the smallest possible value of m + n is
  1. A
    8
  2. B
    6
  3. C
    5
  4. D
    7

Answer: (B) 6 Equations MCQ

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Same concept in other years

See every question on Discriminant conditions for real, distinct or no real roots.

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