1.

Let a, b be roots of x^(2) + 2x + 5 . 71 = 0. "Let" A_(n) be alpha^(n) + beta^(n) , "where " n in N. "If" A_(n+1) + kA_(n-1) - A_(1) A_(n) = 0 then k is equal to ______

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ANSWER :`5 . 71`


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