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Mathematics
Mathematics
Problem
Evaluate the finite series
∑
k
=
0
4
(
1
+
2
⋅
3
k
)
\displaystyle \sum_{k=0}^{4}\bigl(1+2\cdot3^{k}\bigr)
k
=
0
∑
4
(
1
+
2
⋅
3
k
)
.
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