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Geometric Sequences
easy
0:00.0
If
a
n
=
(
−
2
)
n
−
1
a_n = (-2)^{n-1}
a
n
=
(
−
2
)
n
−
1
, find
a
3
a_3
a
3
.
A
4
4
4
B
−
4
-4
−
4
C
−
2
-2
−
2
D
1
1
1
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