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lim
x
→
2
(
∑
n
=
1
9
x
n
(
n
+
1
)
x
2
+
2
(
2
n
+
1
)
x
+
4
)
\lim_{x \rightarrow 2} \left( \sum_{n=1}^9 \frac{x}{n(n+1)x^2 + 2(2n+1)x + 4} \right)
lim
x
→
2
(
∑
n
=
1
9
n
(
n
+
1
)
x
2
+
2
(
2
n
+
1
)
x
+
4
x
)
i…
Mathematics
Problem
lim
x
→
2
(
∑
n
=
1
9
x
n
(
n
+
1
)
x
2
+
2
(
2
n
+
1
)
x
+
4
)
\lim_{x \rightarrow 2} \left( \sum_{n=1}^9 \frac{x}{n(n+1)x^2 + 2(2n+1)x + 4} \right)
lim
x
→
2
(
∑
n
=
1
9
n
(
n
+
1
)
x
2
+
2
(
2
n
+
1
)
x
+
4
x
)
is equal to (a)
9
44
\frac{9}{44}
44
9
(b)
5
24
\frac{5}{24}
24
5
(c)
1
5
\frac{1}{5}
5
1
(d)
7
36
\frac{7}{36}
36
7
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