Find the given sum. Enter the exact value of the answer.
∑
k
=
3
5
\displaystyle {\sum_{{{k}={3}}}^{{5}}}
k
=
3
∑
5
6
(
−
2
3
)
k
−
1
\displaystyle {6}{\left(-\frac{{2}}{{3}}\right)}^{{{k}-{1}}}
6
(
−
3
2
)
k
−
1
=
\displaystyle =
=
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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