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If alpha,beta be the roots of x^2 - x-1 ...

If `alpha,beta` be the roots of `x^2 - x-1 = 0 and A_n = alpha^n +beta^n`, then A. M of `A_(n-1) and A_n`, is

A

`2A_(n-1)`

B

`1/2A_(n+1)`

C

`2A_(n-2)`

D

none of these

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