JEE Main · 2025 · 29 Jan 2025 · Shift 2 · Quadratic Equations and Inequalities

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If the set of all , for which the equation has no real root, is the interval , and , then is equal to
  1. (A)2109
  2. (B)2129
  3. (C)2139✓ Correct
  4. (D)2119

Answer: (C)

Solution

Write the equation as . For no real root, the discriminant is negative:


So , giving .

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JEE Main · 2025 · 29 Jan 2025 · Shift 2 · Single correct option

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