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Black Book Advanced Problems in MathematicsMathematicsQuadratic Equation

If a, b, c be the sides of ABC and equations ax^2 + bx + c = 0 and 5x^2 + 12x + 13 = 0 have a common root, then C is :

Options

  1. A60^
  2. B90^
  3. C120^
  4. D45^ .

Correct answer

B. 90^

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