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Third power sum/By induction/Exercise
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Prove, by induction, the following formula.
∑
i
=
1
n
i
3
=
(
n
(
n
+
1
)
2
)
2
.
{\displaystyle {}\sum _{i=1}^{n}i^{3}={\left({\frac {n(n+1)}{2}}\right)}^{2}\,.}
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