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Mathematics
Problem
Evaluate
∑
k
=
1
n
k
(
k
+
1
)
(
2
k
+
1
)
\displaystyle\sum_{k=1}^{n} k(k+1)(2k+1)
k
=
1
∑
n
k
(
k
+
1
)
(
2
k
+
1
)
and simplify your result.
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