Evaluate the partial sum of the series:
∑
n
=
0
18
(
−
1
)
n
2
n
=
\displaystyle {\sum_{{{n}={0}}}^{{{18}}}}{\left(-{1}\right)}^{{n}}{2}{n}=
n
=
0
∑
18
(
−
1
)
n
2
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