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Mathematics
Problem
Determine the value of
∑
n
=
2
∞
4
(
−
1
3
)
n
\displaystyle\sum_{n=2}^{\infty}4\left(-\dfrac{1}{3}\right)^{n}
n
=
2
∑
∞
4
(
−
3
1
)
n
. a)
−
1
3
-\dfrac{1}{3}
−
3
1
b)
2
3
\dfrac{2}{3}
3
2
c)
1
3
\dfrac{1}{3}
3
1
d)
4
9
\dfrac{4}{9}
9
4
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