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Mathematics
Mathematics
Problem
Calculate
∑
k
=
1
n
(
5
k
2
+
4
k
+
1
)
\displaystyle\sum_{k=1}^{n} (5k^{2}+4k+1)
k
=
1
∑
n
(
5
k
2
+
4
k
+
1
)
, expressing your answer as a polynomial in
n
n
n
.
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