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Let alphaa n dbeta be the roots of x^2-6...

Let `alphaa n dbeta` be the roots of `x^2-6x-2=0,w i t halpha>betadot` If `a_n=alpha^n-beta^nforngeq1` , then the value of `(a_(10)-2a_8)/(2a_9)` is `1` b. `2` c. `3` d. `4`

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