Infinite sequence limit using L'Hopital's rule twice.

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We compute the limit of the infinite sequence n^2/3^n by using L'Hopital's rule twice. In the end, we obtain a limit of zero, because exponential functions grow faster than power functions. In terms of derivatives, we can differentiate 3^n as many times as we like, and we still end up with a factor of 3^n. In contrast, the n^2 term is knocked down to a constant after two applications of the derivative.