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Multiple choice

Let $a, b, c$ be the sides of a triangle. No two of them are equal and real. If the roots of the equation $x^2+ 2(a + b+ c) x + 3 (ab + bc + ca) = 0$ are real, then

  1. $ < 4/3$
  2. $ > 5/3$
  3. $ (1/3 , 5/3)$
  4. $ (4/3 , 5/3)$
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