Let
s
k
=
∑
n
=
1
k
n
(
0.1
)
n
\displaystyle {s}_{{k}}={\sum_{{{n}={1}}}^{{k}}}{n}{\left({0.1}\right)}^{{n}}
s
k
=
n
=
1
∑
k
n
(
0.1
)
n
Find
s
3
.
\displaystyle {s}_{{{3}}}.
s
3
.
s
3
=
\displaystyle {s}_{{{3}}}=
s
3
=
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