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Black Book Advanced Problems in MathematicsMathematicsQuadratic Equation

If a + b + c = 1, a^2 + b^2 + c^2 = 9 and a^3 + b^3 + c^3 = 1 , then the value of 1 a + 1 b + 1 c is :

Options

  1. A2/3
  2. B5
  3. C6
  4. D1.

Correct answer

D. 1.

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