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Geometric Sequences
hard
0:00.0
Find
a
3
a_3
a
3
if
a
n
=
(
−
3
)
n
−
1
a_n = (-3)^{n-1}
a
n
=
(
−
3
)
n
−
1
.
A
9
9
9
B
−
9
-9
−
9
C
3
3
3
D
−
3
-3
−
3
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