If $a$ and $b$ are roots of $x^2 - px + q = 0$,then $\frac{1}{a} + \frac{1}{b} = $

  • A
    $\frac{1}{p}$
  • B
    $\frac{1}{q}$
  • C
    $\frac{1}{2p}$
  • D
    $\frac{p}{q}$

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Find the sum of all possible values of $k$ for which the roots of the equation $x^2 + (k + 1)x + \lambda = 0$ are the square of each other.

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