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If alpha, beta are the roots of 6x^2-2x+...

If `alpha`, `beta` are the roots of `6x^2-2x+1=0` and `s_x=alpha^n+beta^n`, then `Lt_(n->oo) sum_(r=1)^n s_r` is
(a)   `5/17`   (b)   `0`    (c)   `3/37`    (d)   none

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