If $\alpha ,\beta $ are roots of the equation $25{x^2} - 5x - 2 = 0$ and ${A_n} = {\alpha ^n} + {\beta ^n}$, then $\mathop {\lim }\limits_{x \to \infty } \sum\limits_{r = 1}^n {{A_r} = } $
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If $\alpha ,\beta $ are roots of the equation $25{x^2} - 5x - 2 = 0$ and ${A_n} = {\alpha ^n} + {\beta ^n}$, then $\mathop {\lim }\limits_{x \to \infty } \sum\limits_{r = 1}^n {{A_r} = } $