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Mathematics
Problem
Determine the exact value of the series
∑
n
=
1
∞
3
n
+
6
5
n
\displaystyle \sum_{n=1}^{\infty} \dfrac{3^{n}+6}{5^{n}}
n
=
1
∑
∞
5
n
3
n
+
6
. a)
4
4
4
b)
27
10
\dfrac{27}{10}
10
27
c)
3
3
3
d)
9
5
\dfrac{9}{5}
5
9
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