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Let alpha and beta be the roots x^2-6x-2...

Let `alpha and beta` be the roots `x^2-6x-2=0,` with `alpha > beta` If `a_n=alpha^n-beta^n` for or `n >= 1` then the value of `(a_10-2a_8)/(2a_9)` is (a) `1` (b) `2` (c) `3` (d) `4`

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