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Mathematics
Mathematics
Problem
Evaluate, in simplest form in terms of
n
n
n
, the sum
∑
k
=
1
n
(
5
k
−
1
)
\displaystyle \sum_{k=1}^{n}(5k-1)
k
=
1
∑
n
(
5
k
−
1
)
.
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