If $\alpha, \beta, \gamma$ are roots of the equation $x^3 + ax^2 + bx + c = 0$,then $\alpha^{-1} + \beta^{-1} + \gamma^{-1} = $

  • A
    $a/c$
  • B
    $-b/c$
  • C
    $b/a$
  • D
    $c/a$

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