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Sum sign/Application/1/Exercise
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For
k
=
1
,
…
,
8
{\displaystyle {}k=1,\ldots ,8}
, let
a
k
=
2
k
−
5
k
.
{\displaystyle {}a_{k}=2^{k}-5k\,.}
Compute
∑
k
=
1
8
a
k
.
{\displaystyle \sum _{k=1}^{8}a_{k}.}
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