If $\alpha$ and $\beta$ are two real numbers satisfying $\alpha^2 + \beta^2 = 5$ and $3(\alpha^5 + \beta^5) = 11(\alpha^3 + \beta^3)$,then the value of $\alpha \beta$ is:

  • A
    $2$
  • B
    $1$
  • C
    $7$
  • D
    $9$

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$\alpha, \beta, \gamma$ are the roots of the equation $x^3-10 x^2+7 x+8=0$. Match the following and choose the correct answer.
$A. \alpha + \beta + \gamma$$(1) -\frac{43}{4}$
$B. \alpha^2 + \beta^2 + \gamma^2$$(2) -\frac{7}{8}$
$C. \frac{1}{\alpha} + \frac{1}{\beta} + \frac{1}{\gamma}$$(3) 86$
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$(5) 10$

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