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Multiple choice

If $\alpha, \beta, \gamma $ are roots of equation $x^3-2x^2-1=0$ and $ T_n=\alpha^n+\beta^n+\gamma^n$ then the value of $\dfrac{T_{11}-T_8}{T_{10}}$ is equal to

  1. 1

  2. 2

  3. -1

  4. 3

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