Problem

Problem

Let the

n

th term,

t_r

of a series is given by

t_r = \frac{r}{1 + r^2 + r^4}

. The value of

\lim_{n \to \infty} \sum_{r=1}^{n} t_r

is a. 2 b.

\frac{1}{2}

c. 1 d.

\frac{1}{4}

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