Determine the sum of the following series.
∑
n
=
1
∞
(
1
n
+
7
n
9
n
)
\displaystyle {\sum_{{{n}={1}}}^{\infty}}{\left({\frac{{{1}^{{n}}+{7}^{{n}}}}{{{9}^{{n}}}}}\right)}
n
=
1
∑
∞
(
9
n
1
n
+
7
n
)
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\displaystyle
Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity