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Problem
Problem
lim
n
→
∞
∑
r
=
1
n
r
n
2
+
n
+
r
\lim_{n \to \infty} \sum_{r=1}^{n} \frac{r}{n^2 + n + r}
lim
n
→
∞
∑
r
=
1
n
n
2
+
n
+
r
r
equals a. 0 b. 1/3 c. 1/2 d. 1
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